add missing prm.out files
Avoid wasting a whole bunch of memory: we used to have certain fields
only in the Assembly::StokesSystem scratch object, but they were later
added to the StokesPreconditioner scratch object as well. Because the
former derives from the latter, we do not need them in the former any
more.
fix latex formula
Merge pull request #69 from tjhei/manual_fixes

Fix latex formula
update contributors and manual.pdf
Merge pull request #70 from tjhei/update_manual

update contributors and manual.pdf
Now always remove the radial component of velocity from the GPlates plugin.

Before the removal we check that this component is small, to ensure the rotation and projection is working properly. If it is small and we do not want to have it in the solution we might as well remove it completely.
Add an assertion.
Add find_postprocessor
Bugfix and add test
Using NULL instead of 0
Update changes.h
fix compilation and test output

this merges pull request #72:
https://github.com/geodynamics/aspect/pull/72
Add a test for the existing GPlates plugin.
Implement patch for GPlates 1.4

The patch checks for the version of the provided gpml file and also
includes an assertion against creating an unreasonable mesh.
Add test for the new GPlates 1.4 patch.
Update the manual for the GPlates 1.4 patch.
Updated changes.h.
Improved the version check for gplates.
Another bugfix for gplates version check.