Omegapy

From the release of version 3.0, `OMEGA-Py` has been officially validated by the OMEGA team and is distributed as an official OMEGA software alternative to the IDL version.

A complete online documentation has been written and is available at https://astcherbinine.github.io/omegapy/

Updates to the `omega_data.OMEGAdata` class
* Improve binaries processing to have a perfect match with the IDL version of the code, force the use of float32 instead of float64
* Add focal plane and spectrometer temperatures for all channels
* Add incidence and emergence angles w.r.t. the local normal (in addition to the ellipsoid)
* Add `omega.ref_C`, surface reflectance map to be compared with `cos(inci_n)` to check the geometry spatial calibration
* Add geometry information for the V-channel (which is slightly different to the one of the V+L channels)
* Add distance to Sun in km (in addition to a.u. value)

`omega_plots`
* Add option to use the V-channel geometry in all the display functions that use projection (`use_V_geom=True`)

`omega_data`
* Add option to filter only the data cubes acquired with nadir geometry in `find_cube` (`nadir_only=True`)

`omega_data`
* Add `omega_mask` function to generate masks used in the `omega_plots` functions.

`omega_plots`
* Add new projection method for composite maps: `proj_method=2` accounts for the entire footprint of each pixel to create high-resolution maps. But it takes much more time to process.

Fixes several issues related to the use of the module with Windows.

`omega_data`
* Fix compatibility issues with Windows for the importation and correction of `OMEGAdata` objects.
* Disable the use of multiprocessing for thermal correction with Windows.
* Fix definition of custom paths for binary and python files with `set_omega_bin_path()` and `set_omega_py_path()`.

`omega_plots`
* Add the `mask` argument in `show_omega()`.
* Fix gaps between pixels in composite maps.

Update script functions from *SOFT09* to *SOFT10*: extent the L-channel correction up to orbit 13131 (see the *SOFT10 README* for more details).

`omega_data`
* Add the `get_header_qub` and `get_header_nav` methods to the `OMEGAdata` class
* Change average datetime to median datetime (`OMEGAdata` and `find_cube`) to fix issue with partially corrupted geometry informations

`omega_plots`
* Add the `**kwargs` argument *v2 plots functions. Pass additional parameters of the `plt.colormesh` function for the plot.

`omega_data`
* Add the display (`disp`) option to `OMEGAdata`
* Improve the version managing of saved `OMEGAdata` objects

`omega_plots`
* Add the `negative_values` argument for composite maps

`useful_functions`
* Add support of NaNs for the `where_closer()` and `where_closer_array()` functions

* `omega_data` :
* **Full Python 3 implementation** (no longer requires the use of IDL backend routines)
* Add `my` attribute in the `OMEGAdata` class
* Allow user to apply or not corrections on channel V or L during the reading of the binaries

* `omega_plots` :
* Add usage of masks in all the dislay functions
* Add possibility to choose the longitude range between [0, 360] and [-180, 180] with `negatives_longitudes`
* Possibility to extract and replot picked spectra from interactive plots
* Function `show_ibd_v2()` renamed to `show_data_v2()`