revert to original beam code
merge
Merge pull request #2 from Array-Org/gpf

revert to original beam code
operator category metadata
Set the category to 'Geometric Operations'
Merge branch 'Array-Org-gpf'
Merge branch 'master' into nestmod

Conflicts:
	beam-gpf/src/main/java/org/esa/beam/gpf/operators/standard/SubsetOp.java