restructured, generalized and renamed VtkSelectionFilter (now: VtkAppendArrayFilter); selected elements in MshView are now highlighted in render window; fixed issues with geo object selection (list items hadn't been recognised properly)
moved initial radius calculation if various filters to CompositeFilter parent class
added mesh-element-view class and started implementing hightlighting of selected mesh nodes
the element model is now updated by selecting an element in the mesh view, selection-indix parameters for various signals and methods have been unfied to unsigned
split up selection filter into node-selection and element-selection; node selection is working now
added vtkSmartPointer to selection filters for memory management
Corrected highlighting in 3d view.
Better doxygen comments.

This fixes #37.
Made CMake include paths relative.

Replace CMAKE_SOURCE_DIR with CMAKE_CURRENT_SOURCE_DIR and
CMAKE_BINARY_DIR with CMAKE_CURRENT_BINARY_DIR. This allows to use
OGS as a subdirectory in another project.
fixed an issue that would cause a crash upon right-clicking a mesh element
removed remaining debug code
Merge pull request #127 from rinkk/MeshComponentHighlighting

:thumbsup:
Moved class MeshCoarsener to MeshLib/MeshEditing.
Moved Mesh2MeshPropertyInterpol to MeshEditing.
Moved ConvertRasterToMesh to MeshEditing.
Moved MeshGenerator to MeshEditing.
Updated submodule paths.
Moved some classes from folder MeshEditing to folder MeshGenerators.
On Windows static Boost libs are searched for.

As long as dynamically linking is not working on Windows we should not
try to do it.
Merge pull request #119 from TomFischer/RestructureMeshLibFiles

Restructure mesh lib files.