[data] added wrapper function for temporal subsetting; some PEP8 adaptations
[data] added wrapper function for temporal subsetting; some PEP8 adaptations

git-svn-id: https://svn.zmaw.de/svn/pycmbs/trunk@522 46f1e1ae-ddaa-4461-89cc-888b818d8ef3

Former-commit-id: 3b98cb9e956e52b9b57ae34b26fc79449b7fe3dd
pygeo/pycmbs,pygeo/pycmbs