[Git][debian-gis-team/satpy][master] Set distribution to experimental

[Sebastiaan Couwenberg]

Sphinx causes the build to fail, looks like it needs a custom config for
pyspectral to use a non-default rsr_dir like the one used for tests:

Running Sphinx v1.8.4

Configuration error:
There is a programmable error in your configuration file:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/sphinx/config.py", line 368, in
eval_config_file
    execfile_(filename, namespace)
  File "/usr/lib/python3/dist-packages/sphinx/util/pycompat.py", line
150, in execfile_
    exec_(code, _globals)
  File "/build/satpy-0.14.1/doc/source/conf.py", line 26, in <module>
    from satpy import __version__  # noqa
  File "/build/satpy-0.14.1/satpy/__init__.py", line 60, in <module>
    from satpy.scene import Scene  # noqa
  File "/build/satpy-0.14.1/satpy/scene.py", line 30, in <module>
    from satpy.composites import CompositorLoader, IncompatibleAreas
  File "/build/satpy-0.14.1/satpy/composites/__init__.py", line 53, in
<module>
    from pyspectral.near_infrared_reflectance import Calculator
  File
"/usr/lib/python3/dist-packages/pyspectral/near_infrared_reflectance.py", line
38, in <module>
    from pyspectral.utils import BANDNAMES, get_bandname_from_wavelength
  File "/usr/lib/python3/dist-packages/pyspectral/utils.py", line 179,
in <module>
    os.makedirs(LOCAL_RSR_DIR)
  File "/usr/lib/python3.7/os.py", line 211, in makedirs
    makedirs(head, exist_ok=exist_ok)
  File "/usr/lib/python3.7/os.py", line 211, in makedirs
    makedirs(head, exist_ok=exist_ok)
  File "/usr/lib/python3.7/os.py", line 211, in makedirs
    makedirs(head, exist_ok=exist_ok)
  File "/usr/lib/python3.7/os.py", line 221, in makedirs
    mkdir(name, mode)
PermissionError: [Errno 13] Permission denied: '/nonexistent'


Kind Regards,

Bas

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