[cleanup] Remove out-commented code
[cleanup] Remove pointless doxygen group
[cleanup] Don't include misc.hh -- it is not used
Deprecated ctype and dimensionworld

This has been decided on the 2013 dev meeting in Aachen.  Both ctype
and dimensionworld are information pertaining to the geometry of
an element.  In a clean interface they should not be available through
a topological object like Entity.