Updated 0.4 release for critical bug fixes.
What's Changed
* Baseline patch by teuben in https://github.com/GreenBankObservatory/dysh/pull/265
* dummy patch by teuben in https://github.com/GreenBankObservatory/dysh/pull/277
* 20m getps by astrofle in https://github.com/GreenBankObservatory/dysh/pull/282
* 270 psalas review by astrofle in https://github.com/GreenBankObservatory/dysh/pull/285
* 270 readwrite interface for spectra scan scanblock by mpound in https://github.com/GreenBankObservatory/dysh/pull/276
* 20m index fix by astrofle in https://github.com/GreenBankObservatory/dysh/pull/286
* allow BUNIT or TTUNITxx from the DATA column to carry their unit into… by teuben in https://github.com/GreenBankObservatory/dysh/pull/290
* Smoothing1 ps rev by astrofle in https://github.com/GreenBankObservatory/dysh/pull/288
* Fix: slicing of Spectrum objects by astrofle in https://github.com/GreenBankObservatory/dysh/pull/293
* Smoothing1 by teuben in https://github.com/GreenBankObservatory/dysh/pull/284
* Clean tests by astrofle in https://github.com/GreenBankObservatory/dysh/pull/300
* Solve issue 220 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/301
* 133 PS review by astrofle in https://github.com/GreenBankObservatory/dysh/pull/320
* 133 gettp use of cal and calibrate is inconsistent by mpound in https://github.com/GreenBankObservatory/dysh/pull/313
* Introduction of dysh-lab, plus README update by tchamberlin in https://github.com/GreenBankObservatory/dysh/pull/292
* replace index with selection by mpound in https://github.com/GreenBankObservatory/dysh/pull/323
* Adds example notebook showing how to use the metadata getter/setter by astrofle in https://github.com/GreenBankObservatory/dysh/pull/326
* 235 FFT shift by astrofle in https://github.com/GreenBankObservatory/dysh/pull/280
* 318 q6 metadata management by mpound in https://github.com/GreenBankObservatory/dysh/pull/324
* Cat docs devel mwp review by mpound in https://github.com/GreenBankObservatory/dysh/pull/333
* Add unit tests to documentation PR by vcatlett in https://github.com/GreenBankObservatory/dysh/pull/340
* Issue 256 index update by astrofle in https://github.com/GreenBankObservatory/dysh/pull/345
* [pre-commit.ci] pre-commit autoupdate by pre-commit-ci in https://github.com/GreenBankObservatory/dysh/pull/341
* Issue 308 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/346
* Add: additional sanity checks for getspec by astrofle in https://github.com/GreenBankObservatory/dysh/pull/351
* Cat docs devel PS review by astrofle in https://github.com/GreenBankObservatory/dysh/pull/350
* Change docs theme and add notebook rendering by vcatlett in https://github.com/GreenBankObservatory/dysh/pull/331
* SubBeamNod update by astrofle in https://github.com/GreenBankObservatory/dysh/pull/352
* Logging framework by tchamberlin in https://github.com/GreenBankObservatory/dysh/pull/343
* Q6 notebook update by astrofle in https://github.com/GreenBankObservatory/dysh/pull/367
* Issue 365 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/368
* Fix: getfs respects user selection through kwargs -- Issue 315 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/366
* 307 wcs wrong after a smoothed spectrum is indexed ps review by astrofle in https://github.com/GreenBankObservatory/dysh/pull/363
* Fix: coverage CI not finding any data by astrofle in https://github.com/GreenBankObservatory/dysh/pull/375
* Issue 236 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/371
* 307 wcs wrong after a smoothed spectrum is indexed by teuben in https://github.com/GreenBankObservatory/dysh/pull/321
* 348 q6 logging of user commands for data reproducibility by mpound in https://github.com/GreenBankObservatory/dysh/pull/358
* Add: version flag for dysh cli by astrofle in https://github.com/GreenBankObservatory/dysh/pull/383
* Fix: removes leftover print statements by astrofle in https://github.com/GreenBankObservatory/dysh/pull/382
* Nodding2 by teuben in https://github.com/GreenBankObservatory/dysh/pull/395
* Fix: gettp does not separate IFs by astrofle in https://github.com/GreenBankObservatory/dysh/pull/388
* Fix: group by scan and date-obs to generate integration numbers by astrofle in https://github.com/GreenBankObservatory/dysh/pull/392
* Fix: close httpx.client after download by astrofle in https://github.com/GreenBankObservatory/dysh/pull/387
* Dysh data2 simplify data filenames by teuben in https://github.com/GreenBankObservatory/dysh/pull/394
* 192 q6 data selection based flagging by mpound in https://github.com/GreenBankObservatory/dysh/pull/396
* Q7 align spectra by astrofle in https://github.com/GreenBankObservatory/dysh/pull/400
* Fix some log statements by tchamberlin in https://github.com/GreenBankObservatory/dysh/pull/404
* [pre-commit.ci] pre-commit autoupdate by pre-commit-ci in https://github.com/GreenBankObservatory/dysh/pull/398
* Fix all(?) remaining invalid print->logger conversions by tchamberlin in https://github.com/GreenBankObservatory/dysh/pull/407
* Change: align_to and shift now return a copy by astrofle in https://github.com/GreenBankObservatory/dysh/pull/411
* Redesign of the docs by astrofle in https://github.com/GreenBankObservatory/dysh/pull/391
* 191 q6 channel based flagging ps rev by astrofle in https://github.com/GreenBankObservatory/dysh/pull/416
* Drop support for Python 3.9 by tchamberlin in https://github.com/GreenBankObservatory/dysh/pull/406
* 191 q6 channel based flagging by mpound in https://github.com/GreenBankObservatory/dysh/pull/412
* Dysh data2 by teuben in https://github.com/GreenBankObservatory/dysh/pull/399
* Fix: typo in FSScan by astrofle in https://github.com/GreenBankObservatory/dysh/pull/422
* Issue 254 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/420
* 86 baseline corrections by etsmit in https://github.com/GreenBankObservatory/dysh/pull/403
* Fix: use line width error during test by astrofle in https://github.com/GreenBankObservatory/dysh/pull/424
* Fix: support for flag files written by GBTIDL by astrofle in https://github.com/GreenBankObservatory/dysh/pull/431
* 418 read/write of flags in GBTFITSLoad by mpound in https://github.com/GreenBankObservatory/dysh/pull/426
* Issue 336 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/433
* Issue 373 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/435
* Issue 245 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/438
* 401 changing the frame of a spectrum to itself changes its spectral axis by mpound in https://github.com/GreenBankObservatory/dysh/pull/437
* 303 documentation or code error for vel frame by mpound in https://github.com/GreenBankObservatory/dysh/pull/439
* 442 flags not getting applied to calibration routine by mpound in https://github.com/GreenBankObservatory/dysh/pull/444
* 440 implement aperture efficiency calculations by mpound in https://github.com/GreenBankObservatory/dysh/pull/443
* Issue 417 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/436
* Issue 260 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/449
* Issue 174 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/448
* Gbtidl dysh translation by etsmit in https://github.com/GreenBankObservatory/dysh/pull/453
* Q7 online by teuben in https://github.com/GreenBankObservatory/dysh/pull/445
* What's New for 0.4.0 by astrofle in https://github.com/GreenBankObservatory/dysh/pull/450