Update test-py6s-conda-install-scheduled.yml

Update test-py6s.yml

Update test-py6s-conda-install-scheduled.yml

Update test-py6s-conda-install-scheduled.yml

Merge pull request #110 from marujore/master

Fix several URLs

Update docs requirements

Merge pull request #100 from robintw/update-python-versions

Change version specifiers to strings to deal with 3.10 being interpreted as 3.1

Update python versions in the scheduled install test

Update CI python versions, remove 3.6, add 3.9 and 3.10

Merge branch 'master' of github.com:robintw/Py6S

Merge pull request #94 from lopezvoliver/mie

Merge pull request #99 from fnemina/master

Ignore IEEE_UNDERFLOW_FLAG on MacOS