Put each header/source on its own line and sort them.

[[Imported from SVN: r6024]]

I'm actually going to need this class in PDELab.  Of course, I could just use
!AlwaysFalse<T>::value instead, but that makes the code even harder to
understand.

[[Imported from SVN: r6023]]

If there is an implementation available in std or std::tr1 we fall back to
that.

[[Imported from SVN: r6022]]

[[Imported from SVN: r6021]]

[[Imported from SVN: r6020]]

[[Imported from SVN: r6019]]

in dune-istl in revision 1220.  The new file here is intended to be
merged with mpicollectivecommunication.  That will happen in a separate
step.

[[Imported from SVN: r6018]]

The simple modeline was not able to describe the indentation rules used in
that file.

[[Imported from SVN: r6017]]

[[Imported from SVN: r6016]]

[[Imported from SVN: r6015]]

Please somebody verify that this is proper way.

[[Imported from SVN: r6014]]

[[Imported from SVN: r6013]]

[[Imported from SVN: r6012]]

[[Imported from SVN: r6011]]

Dune::Exception objects

[[Imported from SVN: r6010]]

ConfigParser::Parser helper template.

This makes configparsertest compile.

[[Imported from SVN: r6009]]

[[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]]