Some const updates.
Start with shared_ptr - for Mesh.
Add shared_ptr to Space.
Work on shared_ptrs.
Add SpaceSharedPtr for gcc.
Revert a change in Adapt::Adapt due to Agros.
Fixes in shared_ptr.
Progress on shared_ptrs.
Shared_ptrs work on majority of examples.
shared_ptr work.
A gcc fix.
Add some methods to Global.
Fix memory leaks.
Fixes in DG.
Clean up DG and forms.