foam-extend-3.1 Merge Request #38: Port for FreeBSD (open)

Made foam-extend compile on FreeBSD (no special reason. Just because there were FreeBSD-files in wmake/rules but nothing in etc/bashrc). The port has been done in a Vagrant-machine (the provisioning of that machine has been added to the VagrantFile)

The changes to the actual source files are small (only three places if I remember it correctly)

The majority of the changes were about the build-scripts. Mainly:
- FreeBSD does not have bash in /bin. So in all the scripts "#! /bin/bash" has been replaced with "#! /usr/bin/env bash"
- FreeBSD does not use GNU make and GNU find which breaks a number of scripts. The workaround is to install the gnu-variants and add primitive wrapper-scripts to these)
- metis and scotch are installed via the package manager

Currently foam-extend bootstraps and submits tests http://openfoam-extend.sourceforge.net/CDash/buildSummary.php?buildid=849

Most of the broken tests can be explained by
- slow machine (timeouts)
- cfMesh does not compile
- mgridgen does not compile (this explains the dbns-errors)
- actually: most of the ThirdParty-things do not compile

Compilation of the graphical utilities was not even attempted

I'd suggest to include the changes into the nextRelease but not advertise FreeBSD as a supported architecture but as "under development". Maybe someone will want to "take the port under his wings". Otherwise I'll try to iron out problems during the testing phase.

Other architectures are affected due to the changes to the script files. But I think that using /usr/bin/env makes the scripts more portable