merging branches/cdmlib/2.2 [7345:7377] to trunk
see also: https://dev.e-taxonomy.eu/trac/changeset?new=branches%2Fcdmlib%2F2.2%407377&old=branches%2Fcdmlib%2F2.2%407345
Deleted Keyword class
Intensive model change for referenceBase and subclass, smaller model changes for taxonBase and marker
refactoring for parsingProblem
some bugs in parser and cache strategies && return type for hasProblem() changed to int
Merging for cdmlib-model
Media.clone and MediaTest