[uggrid] Support for transferring element data during load balancing

See merge request !172

Remove AlbertaGridEntityPointer

Closes #57

See merge request !168

Forbid implicit conversion to `bool`

See merge request !167

Remove the file entitypointer.hh

Closes #49 and #57

See merge request !164

The file was still included, but it wasn't actually used.

Remove wrapper around `SurfaceElement`

See merge request !165

The `SurfaceElement` function is used nowhere and can be removed from
dune-uggrid once this wrapper is gone.

A small steps towards its complete removal.  Without the deprecated
methods it is easier to see the code that is still used.

Just to increase the pressure towards its complete removal.

test-parallel-ug: return 77 when run in parallel with sequential dune-uggrid

See merge request !159

Remove unused parameter 'res' from CreateBoundarySegment

See merge request !160

Remove implementation of removed `count<codim>()` template method

See merge request !158

Ansgar Burchardt authored 8 years ago and Christoph Grüninger committed 8 years ago

The method was removed from the `Entity` facade class in
0cfc8f31

gridinfo.hh: Use `subEntities(codim)` method instead of removed `count<codim>()` template method

See merge request !157

The `count<codim>()` template method was removed from the `Entity` facade class in
0cfc8f31

Cleanup UGGrid code

See merge request !156

The implementation is identical for both level and leaf intersections.