to FieldVector::size() as a method.

With this patch applied FieldVector::size remains an enum, hence all your
code compiles as before.  However you get a compiler warning explaining
the issue and suggesting to configure with --enable-fieldvector-size-is-method.
If you do so, then FieldVector::size becomes a method, and you may have
to go out and adjust your code.  The configure flag is transitional and
will be removed after dune 2.2 is out.

Remember that there is no smoother way to do the transition, as you can't
have FieldVector::size to be both an enum value and a method at the same
time.

This fixes FlySpray issue 819.


[[Imported from SVN: r6486]]

[[Imported from SVN: r6484]]

[[Imported from SVN: r6483]]

It has been deprecated at least since dune 2.0.

[[Imported from SVN: r6482]]

[[Imported from SVN: r6481]]

Splitted upstream boost test and enable trick.

[[Imported from SVN: r6480]]

[[Imported from SVN: r6479]]

[[Imported from SVN: r6478]]

"add sections on dune-specific AM_CONDITIONALS (thanks to Dan)"

[[Imported from SVN: r6477]]

[[Imported from SVN: r6476]]

[[Imported from SVN: r6475]]

[[Imported from SVN: r6473]]

[[Imported from SVN: r6471]]

[[Imported from SVN: r6470]]

[[Imported from SVN: r6469]]

[[Imported from SVN: r6462]]

[[Imported from SVN: r6461]]

[[Imported from SVN: r6460]]

bug fix in dunecontrol export

[[Imported from SVN: r6459]]

* while traversing the tree, the modules now have a dedicated state:
   MAIN=one of the selected modules
   DEPS=added due to dependencies
   SUGS=added due to suggestions
* use the state to determin the list of dependencies and suggestions
* fix FS#893

[[Imported from SVN: r6458]]

[[Imported from SVN: r6456]]

[[Imported from SVN: r6455]]

* default is "no"

[[Imported from SVN: r6454]]

[[Imported from SVN: r6453]]

- move the iteration on all modules to the main program
- fix order of command when building several modules with several commands

[[Imported from SVN: r6452]]

[[Imported from SVN: r6451]]

[[Imported from SVN: r6450]]

- correctly merge installed modules into the DUNE_CONTROL_PATH
- Fix FS#901

[[Imported from SVN: r6449]]

[[Imported from SVN: r6448]]

[[Imported from SVN: r6447]]

[[Imported from SVN: r6446]]

Make the beighbourids setable.

[[Imported from SVN: r6445]]

[[Imported from SVN: r6444]]

[[Imported from SVN: r6443]]

[[Imported from SVN: r6442]]

[[Imported from SVN: r6441]]

[[Imported from SVN: r6440]]

[[Imported from SVN: r6439]]

[[Imported from SVN: r6438]]

[[Imported from SVN: r6437]]