changed PropertyDescription to be stored in a boost::any called doocsType, prepared comparison for it

hasHistory works as intended with location defaults. Code-cleaning needed, still tons of debug output in.

- parser accepts comments in xml file

bool check in VariableMapper to implement new functionality. Tests still failing due to missing implementation

factored out the actual importing into a function with a plain C++ interface so it can be used without XML file

refactoring: merged processLocationImport and processGlobalImport into one function as they were 90 % idendical