Update documentation for clang deprecation support. It reads still
clumsy and should be cleaned if we officially discontinue support for
older compilers.

[[Imported from SVN: r7004]]

[[Imported from SVN: r6805]]

[[Imported from SVN: r6798]]

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

[[Imported from SVN: r6784]]

[[Imported from SVN: r6510]]

HAS_ATTRIBUTE_DEPRECATED_MSG in config.h and move the rest into
dune/common/deprecated.hh. this should fix older autotools and is
conceptionally cleaner IMHO

Credits to Andreas Lauser.

[[Imported from SVN: r6509]]

[[Imported from SVN: r6254]]

[[Imported from SVN: r6144]]

You always need this header, as config.h is not guaranteed to be
present. Your program should always have sane defaults, which can then
be "optimized" according to defines in config.h


[[Imported from SVN: r6143]]

provided by config.h.

[[Imported from SVN: r6141]]

* update Makefiles and configure

[[Imported from SVN: r5643]]

[[Imported from SVN: r5623]]

[[Imported from SVN: r4963]]