Codraft

New features:

* Sum, average, difference, multiplication: re-converting data to initial type.

* Now supporting PySide2/PyQt4/PyQt5 compatibility thanks to
guidata >= v1.7.9 (using QtPy).

* Now supporting Python 3.9 and NumPy 1.20.

Bug fixes:

* Fixed cross section retrieval feature: in stand-alone mode, a new CodraFT
window was created (that is not the expected behavior).

* Fixed crash when enabling cross sections on main window (needs PythonQwt 0.9.2).

* Fixed ValueError when generating a 2D-gaussian image with floats.

* HDF5 file import feature:

* Fixed unit processing (parsing) with Python 3.

* Fixed critical bug when clicking on "Check all".

New experimental features:

* Experimental support for PySide2/PyQt4/PyQt5 thanks to guidata >= v1.7.9 (using QtPy).

* Experimental support for Python 3.9 and NumPy 1.20.

New minor features:

* ZAxisLogTool: update automatically Z-axis scale (+ showing real value)

* Added contrast test (following issues with "eliminate_outliers")

New minor features:

* New test script for global application test (test_app.py).
* Improved CodraFT launcher (app.py).

New minor features:

* LMJ-formatted HDF5 file import: tree widget item's tooltip now
shows item data "description".

Bug fixes:

* Fixed runtime warnings when computing centroid coordinates on
an image ROI filled with zeros.

* LMJ-formatted HDF5 file support: fixed truncated units.

Bug fixes:

* Fixed LMJ-formatted HDF5 files: strings are encoded in "latin-1"
which is not the expected behavior ("utf-8" is the expected
encoding for ensuring better compatibility).

New features:

* LMJ-formatted HDF5 file import: added support for axis units and labels.

* New curve style behavior (more readable): unselecting items by default,
circling over curve colors when selecting multiple curve items.

Bug fixes:

* Fixed LMJ-formatted HDF5 file support in CodraFT data import feature.