Third phase of code refactoring: move callbacks where they belong
& drastically reduce namespace pollution.

There's no new functionality for now: PLEASE TEST THAT EVERYTHING
WORKS AS IT USED TO BEFORE.

There's no new functionality for now: PLEASE TEST THAT EVERYTHING
WORKS AS IT USED TO BEFORE.

multi-window & multi-coordinate system drawing.

There's no new functionality for now: PLEASE TEST THAT EVERYTHING
WORKS AS IT USED TO BEFORE.

view limit

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

- added "auto-scroll" toggle in msg window

- 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

* no lc at points == MAX_LC (-> lc/10 like for STEP & co)
* don't specify a char length at points by default when creating a geo with the GUI

* add lc_extend_from_boundary in GUI

- more "const char *" fixes

Options/GUI for partitioning software