Make number of smoothing steps and scaling factor for prolongation of AMG adjustable
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of https://github.com/OPM/opm-core
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branches 'origin/master' and 'upstream/master'
Finished customizability in terms of steps and prolongateFactor
Fix a few doxygen issues with the tutorials
Merge pull request #231 from andlaus/fix_doxygen

Fix a few doxygen issues with the tutorials
Merge pull-request #232 from rolk/232_distrib
Merge branch 'release/2013.03' of git://github.com/OPM/opm-core
Ensure (average of) tracers sum to one for DG1.
Add phaseUsage() method to BlackoilPropertiesInterface.

Also implement method in derived classes.
Merge branch 'master' of git://github.com/OPM/opm-core
Always interpret 'ref_pressure' as a double

Otherwise, when specifying (e.g.)

   ref_pressure=1.0e-5

(1 Pascal in bars), the value gets reinterpreted as

   ref_pressure=1

which is one bar.
Merge pull request #241 from bska/double-refpress

Always interpret 'ref_pressure' as a double
Make implementation class "package" visible

Since a definition of the class is not in the header, no other
compilation units can safely access the internals of the Impl class
anyway, so it may as well be a regular struct so that the outer class
(SimulatorIncompTwophase) can access it.
Merge pull request #240 from atgeirr/tof-improvements

Ensure (average of) tracers sum to one for DG1.