EDIT

adding permission handling and writing a test for usermanagement

bugfix for imageGallery flag not set #1830

tests for image galleries in derived unit facade and bugfix for test in DescriptionServiceImplTest which didn't run in maven.

Refactoring of taxon business logic methods and started to write tests for these methods. The tests are far from finished.

merge 3.0.2 to trunk

added unplaced and excluded attribute to Taxon

bugfix for derived unit facade test