Reduce number of warnings in MeshLib when using clang.
Use GEOModels in ProjectData only when we build the gui version.
Fixed spelling mistake.
[doc] Update Doxygen.in for 1.8.6 version.

Only comments are changed and new default values added.
[ML] Correct shadowing of variables.
[style] Remove semicolons; Empty return docs; Indentation.
[OGSLib] Removed old OGS-5 code.
[ML] Use LIS_INT type instead of int.
Merge pull request #300 from endJunction/Style

Style