[GL] Renamed method getGEOObject to getGeoObject.
[GL] Changed getGeoObject implementation.

Added more checks and error messages.
Reuse existing GeoLib::convertGeoTypeToString.
[GL] Fixed merge mistake in GUI.

Rename getGEOObject to getGeoObject.
[GL] Remove duplicate error messages.
when loading data sets into GUI, the respective pipeline items are now automatically selected and activated
filenames of imported vtk-files are now visible in the pipeline
[GeoLib] Corrected documentation.
[GeoLib] Test for merging geometries with names.
[GeoLib] SimplePolygonTree: added method getNChilds().
[FileIO] GMSHPolygonTree: corrected the case the recursion reached the leafes.
Merge pull request #305 from rinkk/VTKFileNameInPipeline

VTK filenames in pipeline
Merge pull request #301 from endJunction/GeoLib_GeoObject

GeoLib GeoObject retrival rewrite.
Merge pull request #304 from rinkk/ActivePipelineItemOnLoad

Automatic activation of loaded data sets in VTK pipeline
Merge pull request #307 from TomFischer/BugFixGMSH

GMSH: include stations information into the mesh