handle indexsets that only contain indices also present on other
processes.

Compiles! Not tested yet!

[[Imported from SVN: r465]]

[[Imported from SVN: r464]]

Introduced some typedefs.

Fixed some includes.

[[Imported from SVN: r463]]

[[Imported from SVN: r462]]

[[Imported from SVN: r461]]

[[Imported from SVN: r460]]

[[Imported from SVN: r459]]

[[Imported from SVN: r458]]

[[Imported from SVN: r457]]

[[Imported from SVN: r456]]

[[Imported from SVN: r455]]

[[Imported from SVN: r454]]

[[Imported from SVN: r453]]

[[Imported from SVN: r452]]

(btw. configure never honored COMP and/or CXXCOMP)

[[Imported from SVN: r451]]

[[Imported from SVN: r450]]

[[Imported from SVN: r449]]

All tests should run through now again.

[[Imported from SVN: r448]]

for complex<T> now ...

[[Imported from SVN: r447]]

matrix row.

Compiles again and works for the sequential case.

[[Imported from SVN: r446]]

[[Imported from SVN: r445]]

[[Imported from SVN: r444]]

... well now my lib builds again and the test works aswell

... hope that's all ...

[[Imported from SVN: r443]]

[[Imported from SVN: r442]]

This is needed as one wants to setup only those indices involved in
the  communication.

First step in making AMG work with those smaller index sets.

[[Imported from SVN: r441]]

changed include

[[Imported from SVN: r440]]

renamed file

[[Imported from SVN: r439]]

Testing still pending.

[[Imported from SVN: r438]]

[[Imported from SVN: r437]]

[[Imported from SVN: r436]]

[[Imported from SVN: r435]]

[[Imported from SVN: r434]]

[[Imported from SVN: r433]]

Now Entries of a BlockVector can be communicated.

[[Imported from SVN: r432]]

[[Imported from SVN: r431]]

[[Imported from SVN: r430]]

[[Imported from SVN: r429]]

level as template parameter. Defaults to 1, so nothing needs to be changed in
existing code.

[[Imported from SVN: r428]]

[[Imported from SVN: r427]]

[[Imported from SVN: r426]]