* gnu/packages/simulation.scm (openfoam)[description]: Add a period to the end of the sentence.
*gnu/packages/patches/openfoam-4.1-cleanup.patch: New file *gnu/packages/simulation.scm: New file *gnu/local.mk (GNU_SYSTEM_MODULES): Add module. (dist_patch_DATA): Add patch. Signed-off-by: Ludovic Courtès <ludo@gnu.org>