fixed bug in test for days_per_month
fixed bug in test for days_per_month

git-svn-id: https://svn.zmaw.de/svn/pycmbs/trunk@504 46f1e1ae-ddaa-4461-89cc-888b818d8ef3

Former-commit-id: d5f827f9822cc8f3ab76eec2d5d23ed4612597e5
pygeo/pycmbs,pygeo/pycmbs