moved functions trim(), replaceString(), splitString() and template functions number2str() and str2number() into namespace BaseLib

This should fix #20.

changed name of file AxisAlignedBoundingBox.h to AABB.h according to the style guid rule: class name equals file name

removed unnecessary files in meshlib; added geo-mapping to gui (for now just for meshes, more to come real soon

Simply create a settings object:

    QSettings settings;

The application name and organization parameters are now given as a
global configuration on the QApplication of the DataExplorer,
see 82e30203.

OGS_VERSION_AND_PERSONS => x.x.x (author names)
OGS_VERSION             => x.x.x

expanded functionality of MshLayerMapper / MshEditDialog to also support adding layers individual thickness without raster files

changed error messages in meshlayermapper; adapted node numbering for geolib::surface and gmsh-import to be consistent with vtk & meshlib

Setup script modified to use newer Qt (4.7.4 -> 4.8.3), VTK (5.8 ->
5.10) and shapelib (1.3.0b2 -> 1.3.0).

getSurfaceMesh is working now; getSurfaceNodes is working now; meshes are now tested for unused nodes (such nodes are removed upon loading)