[data] BUGFIX: implemented that HP filter can also work with masked arrays
[data] BUGFIX: implemented that HP filter can also work with masked arrays

git-svn-id: https://svn.zmaw.de/svn/pycmbs/trunk@517 46f1e1ae-ddaa-4461-89cc-888b818d8ef3

Former-commit-id: 5029f298d3789c72642bb536ff9139b0c2e6f7af
pygeo/pycmbs,pygeo/pycmbs