* the array synopsis in the standard uses struct, so why don't we?
* add method empty (demanded by the standard, many more are actually missing)
* consistently use std::size_t instead of size_t (for std::array it should even be std::size_t)
* simplify operator<<
* unify indentation (to 2)
* make_array is a function and not a method
* improve comments on the preprocessor branches (to improve readability)

[[Imported from SVN: r6868]]

Fix printing of zero-dimensional arrays, FS#1148.
(Thanks to Elias Pipping for testing the patch)

[[Imported from SVN: r6865]]

- update fvector test
(thanks to Matthias Wohlmuth)

[[Imported from SVN: r6863]]

- add dotproduct for basic data types
(thanks to Matthias Wohlmuth)

[[Imported from SVN: r6862]]

This fixes FS 1147.  Thanks to Elias Pipping for the patch.

[[Imported from SVN: r6819]]

Patch contributed by Matthias Wohlmuth

[[Imported from SVN: r6816]]

[[Imported from SVN: r6809]]

[[Imported from SVN: r6808]]

[[Imported from SVN: r6807]]

[[Imported from SVN: r6805]]

assignment.

[[Imported from SVN: r6802]]

[[Imported from SVN: r6801]]

[[Imported from SVN: r6798]]

dune-geometry.

[[Imported from SVN: r6796]]

[[Imported from SVN: r6795]]

[[Imported from SVN: r6792]]

mpitraits.hh forward declares std::pair, which is illegal by the standard, and clang stumbles over that.
Fixes FS#1121.
(Thanks to Steffen Müting for the patch)

[[Imported from SVN: r6791]]

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

[[Imported from SVN: r6784]]

[[Imported from SVN: r6775]]

[[Imported from SVN: r6774]]

"lib1 lib2 lib3", which caused an error!)

[[Imported from SVN: r6755]]

[[Imported from SVN: r6748]]

[[Imported from SVN: r6747]]

libraries under the same name.

[[Imported from SVN: r6731]]

[[Imported from SVN: r6730]]

according to the standard std::pair is a struct

[[Imported from SVN: r6727]]

modul name (lower case with dashes).

These leads to kind of weired variabable names (dune-common_DIR,
dune-common_LIBRARIES, etc.) but finds non-installes modules
easier. You just sets CMAKE_PREFIX_PATH to the directory containing
the modules.

[[Imported from SVN: r6724]]

[[Imported from SVN: r6723]]

[[Imported from SVN: r6718]]

No clue what that patch was supposed to due,
but it even slipped into dune 2.1.

[[Imported from SVN: r6716]]

[[Imported from SVN: r6714]]

Backported from Martin's development branch.

[[Imported from SVN: r6713]]

Backported from Martin's development branch,
minus some whitespace changes.  Thanks.

[[Imported from SVN: r6712]]

[[Imported from SVN: r6711]]

[[Imported from SVN: r6709]]

[[Imported from SVN: r6708]]

(Merge r6705 from trunk)

[[Imported from SVN: r6706]]

[[Imported from SVN: r6705]]

[[Imported from SVN: r6683]]

[[Imported from SVN: r6682]]