With the exception of mpicollectivecommunication.hh
and propertymap.hh, which I didn't understand.

[[Imported from SVN: r6784]]

Measurements showed no speed increase at all, compared
to retrieving the last element first and then calling
pop_back().  See dune-grid commit message 7837 for
details on the measuring process.

[[Imported from SVN: r6549]]

[[Imported from SVN: r6548]]

[[Imported from SVN: r6547]]

[[Imported from SVN: r6545]]

- it is used by at least 2 of our modules and might proove useful for
  others aswell

[[Imported from SVN: r5882]]