Drymass

- drop support for Python 3.5
- ref: background correction in convert.py uses background indices
starting at 0 while the CLI keeps using indices starting at 1
- fix: hologram keyword arguments were not used for background
correction
- fix: case where index-based background correction does not work
- feat: sphere analysis is picked up where left off in previous run
- command line interface:
- fix: allow white spaces for input data path argument
- fix: improve verbosity of status messages
- docs: add troubleshooting section

- feat: reuse computed ROI data from previous runs
- ref: update [roi] configuration key names to reflect pixel units:
"dist border px", "exclude overlap px", "pad border px"
- fix: improve verbosity of error messages
- fix: config value "[roi] size variation" must be in interval [0,1]
- fix: handle ROIs with failed edge detection in "dm_analyze_sphere"

- feat: add local thresholding step before segmentation
- fix: check number of qpimages in sensor_data.h5 during dm_convert
- fix: "exclude overlap" only used for background image
- fix: not possible to analyze phasics data folder when raw data
is present (qpformat 0.1.5)

- automatically fix inverted ranges when loading "roi_slices.txt"
- remove "holo" section from drymass.cfg if not relevant
- allow user-defined ROI selection via "[roi] enabled = False"
- added hologram analysis parameter tuning (qpimage 0.1.6)
- added 2D model fitting to sphere analysis (qpsphere 0.1.4)
- fixed `cfg_funcs.int_or_str`

- allow to disable sensor image tif export
- support input QPI data with different shapes
- fixed wrong assumption about definition of dry mass in cells
(water vs. intracellular salt solution)
- allow to use separate file or series index for background correction
with experimental data (6)
- small visualization improvements

- add file name to image identifier and update plotting (4)
- renamed "object" to "identifier" in statistics output
- binary-based background correction (manual or automated threshold)
- allow to disable background correction with "[bg] enabled = False"
- ask for missing meta data keys in CLI only when they are required