Using range based for loop and auto keyword to make ode better readable.

This is automatic replacement with
ag '(?<!std::)size_t(?!\w)' --ignore-dir=ThirdParty -l | xargs perl -pi.bak -e  's/(?<!std::)size_t(?!\w)/std::size_t/g'

Renamed attribute _mesh to _surface_mesh for better distinction between the the method argument mesh and the object attribut _mesh.

- moved ProjectData.* to Applications/ApplicationsLib
- removed Vrpn folder in DataExplorer

fixed normal vector for surface extraction (was overlooked when changing node numbering a few months ago)