for all geometry tpyes of all entities in this set.

[[Imported from SVN: r3315]]

[[Imported from SVN: r3314]]

also forgot to delete sichCache in Grid Desctructor.

[[Imported from SVN: r3313]]

removed deprecated index,globalIndex and subIndex methods.

[[Imported from SVN: r3312]]

[[Imported from SVN: r3311]]

[[Imported from SVN: r3310]]

via level walk.

[[Imported from SVN: r3309]]

[[Imported from SVN: r3308]]

[[Imported from SVN: r3307]]

[[Imported from SVN: r3306]]

[[Imported from SVN: r3305]]

Also fug bix in Level iterator for faces.

[[Imported from SVN: r3304]]

Now list of all vertices for elements on given level is created then used
for iteration.

[[Imported from SVN: r3303]]

[[Imported from SVN: r3302]]

[[Imported from SVN: r3301]]

[[Imported from SVN: r3300]]

[[Imported from SVN: r3299]]

[[Imported from SVN: r3298]]

[[Imported from SVN: r3297]]

The thing was to call outside() on the intersection iterator only once and
store the EntityPointer. Now it is only slightly more expensive than assembly on tetrahedral
mesh and the same cost as assembly on hex mesh.

[[Imported from SVN: r3296]]

[[Imported from SVN: r3295]]

[[Imported from SVN: r3294]]

[[Imported from SVN: r3293]]

[[Imported from SVN: r3292]]

Also removed not needed getCoordVec method.

[[Imported from SVN: r3291]]

[[Imported from SVN: r3290]]

[[Imported from SVN: r3289]]

[[Imported from SVN: r3288]]

[[Imported from SVN: r3287]]

[[Imported from SVN: r3286]]

separation of LeafIterator and LevelIterator moved from TreeIterator to
EntityPointer, because entities alos have to know, where they come from.
This information is stored be getNewEntity is called.
This Information is needed by the IntersectionIterator. Now the iterator
does different thing when started from and LevelIterator Entity.

The method getNewEntity is specialised now for entities of codim 0,
should be much faster now.

Also bug fix in intersection iterator, when setting up the neighbor in 3d,
the face twist has to be calculated. The neighbors are set up right now.

[[Imported from SVN: r3285]]

[[Imported from SVN: r3284]]

[[Imported from SVN: r3283]]

[[Imported from SVN: r3282]]

missing cases added in the constructor. Also couldnt find symmetric quad- rules for order > 3 for tetrahedron from ugquadrature file

[[Imported from SVN: r3281]]

[[Imported from SVN: r3280]]

[[Imported from SVN: r3279]]

[[Imported from SVN: r3278]]

[[Imported from SVN: r3277]]

[[Imported from SVN: r3276]]