meraculous: Initial packaging
The example run given in the [manual](http://jgi.doe.gov/data-and-tools/meraculous) ran okay. The `use_cluster` setting (i.e., the one that causes the `run_meraculous.sh` script to try and submit jobs to the cluster) doesn't work as the default scripts assume [SGE](https://en.wikipedia.org/wiki/Oracle_Grid_Engine). Fixing that would require a lot of work.
See merge request !2
Openfoam expression
This adds an OpenFOAM nix expression. It
* provides binary wrappers that automatically source the *etc/bashrc* script before running, and
* provides *-mpi wrappers that automatically call the correct mpirun with `-n <num>` set by the partition.
It has been tested on goblin in both MPI and non-MPI mode on the [damBreak example](http://cfd.direct/openfoam/user-guide/damBreak).
See merge request !1
