[[Imported from SVN: r8184]]

[[Imported from SVN: r8183]]

So far, there were three disjoint namespaces: UG, UG2d and UG3d.
Now, everything is contained in the namespace UG.  Additionally,
stuff that depends on the dimension is contained in the namespaces
D2 and D3 which are defined within UG.
This allows to put the user-defined types INT, SHORT, etc. into the
namespace UG without having to put namespace prefixes in front of
each and every occurrence of them in a header.  On the downside,
I cannot use END_NAMESPACE anymore to end a dimension-dependent
namespace.  Now there is a separate END_UGDIM_NAMESPACE for that.

[[Imported from SVN: r8182]]

[[Imported from SVN: r8181]]

[[Imported from SVN: r8180]]

[[Imported from SVN: r8179]]

[[Imported from SVN: r8178]]

[[Imported from SVN: r8177]]

[[Imported from SVN: r8176]]

[[Imported from SVN: r8175]]

[[Imported from SVN: r8174]]

[[Imported from SVN: r8173]]

[[Imported from SVN: r8172]]

[[Imported from SVN: r8171]]

This is necessary if you want to use Dune UGGrids in 2d and 3d at the same
time.

[[Imported from SVN: r8170]]

[[Imported from SVN: r8169]]

[[Imported from SVN: r8168]]

[[Imported from SVN: r8167]]

[[Imported from SVN: r8166]]

[[Imported from SVN: r8165]]

[[Imported from SVN: r8164]]

Also, tree.c and pfile.c are dimension-independent and need to
be compiled only once.

[[Imported from SVN: r8163]]

with --enable-dune.  This allows the dune build system to check whether
ug has been built with that option.  This will be helpful because the
errors that result from forgetting --enable-dune are extremely
strange.

[[Imported from SVN: r8162]]

[[Imported from SVN: r8161]]

[[Imported from SVN: r8160]]

[[Imported from SVN: r8156]]

->unanonymize them

[[Imported from SVN: r8155]]

with doxygen, some of the stuff in low.doc is redundant, and what is not is better placed directly in the code

[[Imported from SVN: r8154]]

[[Imported from SVN: r8153]]

[[Imported from SVN: r8152]]

Some documentation and white-space cleanup

[[Imported from SVN: r8150]]

[[Imported from SVN: r8149]]

bugfix: now that typedefs are used, the type UINT has to be defined separately for each architecture

[[Imported from SVN: r8148]]

to const-casts though.  Strange.

[[Imported from SVN: r8147]]

[[Imported from SVN: r8146]]

[[Imported from SVN: r8145]]

[[Imported from SVN: r8144]]

[[Imported from SVN: r8143]]

[[Imported from SVN: r8142]]

[[Imported from SVN: r8140]]