the boundary conditions is still missing.

[[Imported from SVN: r4167]]

[[Imported from SVN: r4166]]

[[Imported from SVN: r4165]]

the code.

Make SIZE protected instead of private so derived classes can use it.

[[Imported from SVN: r4164]]

[[Imported from SVN: r4163]]

solves Task #42

[[Imported from SVN: r4162]]

[[Imported from SVN: r4161]]

  (is not specific for P1 elements any more)
- reworked template parameters such that the P1Operator does not need
  to know the local assembler type
- assemble method now gets a reference to the base class, so you
  are forced to use it.

[[Imported from SVN: r4160]]

[[Imported from SVN: r4159]]

[[Imported from SVN: r4158]]

[[Imported from SVN: r4157]]

[[Imported from SVN: r4156]]

[[Imported from SVN: r4155]]

[[Imported from SVN: r4154]]

[[Imported from SVN: r4153]]

[[Imported from SVN: r4152]]

[[Imported from SVN: r4151]]

[[Imported from SVN: r4150]]

[[Imported from SVN: r4149]]

[[Imported from SVN: r4148]]

[[Imported from SVN: r4147]]

[[Imported from SVN: r4146]]

[[Imported from SVN: r4145]]

[[Imported from SVN: r4144]]

[[Imported from SVN: r4143]]

- base class for local assembler

[[Imported from SVN: r4142]]

- grid is conforming on each level
- grid refines with hanging nodes

[[Imported from SVN: r4141]]

[[Imported from SVN: r4140]]

[[Imported from SVN: r4139]]

[[Imported from SVN: r4138]]

[[Imported from SVN: r4137]]

[[Imported from SVN: r4136]]

[[Imported from SVN: r4135]]

[[Imported from SVN: r4134]]

[[Imported from SVN: r4133]]

[[Imported from SVN: r4132]]

Also check subId because the belongs to the interface and work for all
grid. Did not test UG, because new version not installed.

[[Imported from SVN: r4131]]

[[Imported from SVN: r4130]]

[[Imported from SVN: r4129]]

[[Imported from SVN: r4128]]