Use SPDX license identifier and set all files to GLP3+ to be consistent with...

Use SPDX license identifier and set all files to GLP3+ to be consistent with license headers in the source files. Excluded tests from being installed via 'pip install'. Set development status to 'beta'. Updated version info.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>
3 jobs for v0.4.6 in 1 minute and 11 seconds (queued for 5 minutes and 10 seconds)
latest
Status Name Job ID Coverage
  Test
passed test_sensormapgeo #45321

00:00:51

87.0%
passed test_styles #45322

00:00:07

 
  Deploy
passed deploy_pypi #45323

00:00:12