view limit

cleanup high order

- don't die silently when a read function fails
- fixed while bunch of compiler warnings

vsnprintf unknown in visual 2003

- added "auto-scroll" toggle in msg window

- use std::string in Draw_String & co
- add pyramid test

- fixed missing getShapeFunction/getGradShapeFunction + return all sf
  at once so we can implement MElement in term of these consistently
  (w or w/o FunctionSpace)

- can now merge multiple meshes and remove duplicate mesh vertices
  (useful e.g. when merging several STLs)

- added easy interface to create model-based postpro datasets on the
  fly + use this for mesh quality stats