implemented the new index and id mechanism by using new data fields in the UG data structures.  Now if only it didn't crash when I turn it on... :-(

[[Imported from SVN: r2452]]

[[Imported from SVN: r2451]]

[[Imported from SVN: r2450]]

[[Imported from SVN: r2449]]

[[Imported from SVN: r2448]]

[[Imported from SVN: r2447]]

[[Imported from SVN: r2446]]

[[Imported from SVN: r2445]]

[[Imported from SVN: r2444]]

[[Imported from SVN: r2443]]

[[Imported from SVN: r2442]]

* updated SGrid and YaspGrid

[[Imported from SVN: r2441]]

[[Imported from SVN: r2440]]

[[Imported from SVN: r2439]]

* Test program
* experiments for Expression Templates for Matrizes

[[Imported from SVN: r2438]]

[[Imported from SVN: r2437]]

Changed ALU3dGridFaceInfo to handle new ReferenceElements -> got rid of GridImp template parameter so that the physical dependencies could be reduced

[[Imported from SVN: r2436]]

[[Imported from SVN: r2435]]

All should run through now!

[[Imported from SVN: r2434]]

Instead of specifying all of them for all class using IndexSet, those
class now have the index set type as a template parameters.

[[Imported from SVN: r2433]]

Renamed cube in ReferenceCubeContainer to cube_, otherwise I have a name clash with GeometryType cube; did some indentation as well

[[Imported from SVN: r2432]]

[[Imported from SVN: r2431]]

[[Imported from SVN: r2430]]

[[Imported from SVN: r2429]]

[[Imported from SVN: r2428]]

[[Imported from SVN: r2427]]

[[Imported from SVN: r2426]]

[[Imported from SVN: r2425]]

[[Imported from SVN: r2424]]

[[Imported from SVN: r2423]]

[[Imported from SVN: r2422]]

[[Imported from SVN: r2421]]

[[Imported from SVN: r2420]]

Added leaf{begin,end} with no level arguments (methods with level arguments shall be removed later to allow for an easy transition)

[[Imported from SVN: r2419]]

[[Imported from SVN: r2418]]

[[Imported from SVN: r2417]]

[[Imported from SVN: r2416]]

[[Imported from SVN: r2415]]

[[Imported from SVN: r2414]]

[[Imported from SVN: r2413]]