[[Imported from SVN: r6008]]

Often the configuration file is given on the command line.  However,
configuration entries can also be given on the command line, and should
usually take precedence over those from a file.  With these changes it is
possible to read entries from the command line, possibly setting one
configuration entry to the name of a config file in the process.  The
configuration file can then be parsed, setting entries, which have not been
set on the command line.  Entries which already have been set on the command
line will retain their command-line values.

[[Imported from SVN: r6007]]

[[Imported from SVN: r6006]]

[[Imported from SVN: r6005]]

[[Imported from SVN: r6004]]

[[Imported from SVN: r6003]]

[[Imported from SVN: r6002]]

[[Imported from SVN: r6001]]

[[Imported from SVN: r6000]]

[[Imported from SVN: r5999]]

[[Imported from SVN: r5998]]

[[Imported from SVN: r5997]]

seem to change much when compiled with optimization (besides the shorter
code), but leads to a 50% run-time reduction when compiled without
optimization.

[[Imported from SVN: r5996]]

[[Imported from SVN: r5995]]

[[Imported from SVN: r5994]]

[[Imported from SVN: r5993]]

[[Imported from SVN: r5992]]

[[Imported from SVN: r5989]]

so modify the interface to only contain create and destroy methods

[[Imported from SVN: r5988]]

[[Imported from SVN: r5985]]

Please merge to release.

[[Imported from SVN: r5981]]

(this way I don't have to use the Grid for this purpose)

[[Imported from SVN: r5980]]

[[Imported from SVN: r5979]]

[[Imported from SVN: r5978]]

[[Imported from SVN: r5977]]

[[Imported from SVN: r5976]]

- remove old unused configure option

[[Imported from SVN: r5975]]

[[Imported from SVN: r5973]]

[[Imported from SVN: r5970]]

[[Imported from SVN: r5966]]

This should fix FS#769 "svn dune-pdelab does not build on top of 2.0beta1"

[[Imported from SVN: r5964]]

[[Imported from SVN: r5963]]

Please merge to release branch!

[[Imported from SVN: r5962]]

(the performance impact has yet to be researched...)

[[Imported from SVN: r5958]]

[[Imported from SVN: r5957]]

[[Imported from SVN: r5956]]

[[Imported from SVN: r5955]]

to STL)

This will need some further discussion, of course. It is intended for FS #766,
i.e., use an allocator to construct polymorphic objects in GenericGeometries.

[[Imported from SVN: r5954]]

[[Imported from SVN: r5953]]

[[Imported from SVN: r5952]]