moved gms- and shp-interface to FileIO-namespace; added a bit of documentation
added GMSH helper-classes to seperate namespace
removed --readNonBlankLineFromInputStream-- since it is not called from anywhere
added legacy interfaces to Legacy namespace
renamed FileIO/MeshIO to FileIO/GmshIO and moved GmshInterface and TetGenInterface on level up
fixed missing namespace changes
Merge pull request #318 from rinkk/FileIOCleanUp

FileIO structure clean up.
Split GMSH and Legacy namespaces.
Remove two unused functions from FileIO.
moved misplaced comment to correct position
Added dedicated file for namespace documentation
fixed doxygen tagging for nested namespaces
Merge pull request #319 from rinkk/NamespaceDocumentation

Namespace documentation
added baselib namespace doc
added missing namespace name
changed MeshElemType2String to convert to complete words instead of abbreviations
added missing case in VTK to OGS mesh conversion
fixed error message
[BoostXmlCndInterface] Changed sig. of virtual Writer::write().
[BoostXmlCndInterface] Made reading/parsing of geometry tag xml more clear.
[BoostXmlConditionInterface] Added CondType _type to decide what type of condition should be written.
[BoostXmlCndInterface] explicit to constructor.