simplify API calls
there is no featurecolumn id anymore so column count will be one less
reflect change of wfs connector interface
feature column id is now an fix attribute of its own (reducing the column count by one)
no comment
added example of subfeature use
added transform test
Merge remote-tracking branch '52n/master'
reflect #include changes from IlwisCore
use FeatureCoverage instead of wrapped IlwisData object