Rapidtide

* (rapidtide, showxcorrx, showarbcorr, showstxcorr, ccorrica, aligntcs, filttc) Changed argument handling for arbitrary filters. Specify pass freqs with --filterfreqs, stop freqs with --filterstopfreqs.
* (happy) Code cleanup, improved tensorflow selection.
* (Docker) Improvements to version specification, entry point.
* (testing) Increased coverage.
* (packaging) Multiple corrections in support files.

* (happy, rapidtide) Now properly handle negative mklthreads specification.
* (Dockerfile) Update package versions.
* (Docker container) Added happy test.
* (package) Further increased test coverage.

* (rapidtide) Fixed text file (nirs) processing.
* (rapidtide) Fixed a search range setting error.
* (rapidtide) Fixed the default method for global mean signal generation.
* (rapidtide) Fixed a crash when using the mutualinfo similarity metric.
* (rapidtide, io) Significant improvement to CIFTI handling - now properly read and write parcellated scalars and time series.
* (io) Vastly improved reading in arbitrarily large text files.
* (stats) Fixed a bug in getfracvals when you try to find the maximum value.
* (package) Began aggressive implementation of smoke tests (exercise as many code paths as possible to find crashes in neglected code - this is how the above bugs were found).
* (package) More logging refinement.

* (rapidtide) Added the '--negativegradient' option in response to https://github.com/bbfrederick/rapidtide/issues/67
* (rapidtide) Added flexibility to regressor input (can use multicolumn and BIDS text files).

* (happy) Fixed logmem calls to work with new logging structure (and not crash immediately).

* (rapidtide, tidepool) Fixed reading and writing the globalmean mask.
* (package) Fixed a stupid bug that surfaced when reading in all columns of a text file as input (really, this time).