Lammps: update PYTHONPATH info in caveats.

Closes #797.
MB-System: New formula.
Pastix: bug fix release.
last 418: New formula

LAST finds similar regions between sequences.
openblas: Remove outdated comment

I made that comment ages ago when OpenBLAS did download an LAPACK
on-demand during build. This is no longer the case as far as I can tell.
openblas: 0.2.9rc2

Going to a RC here (exceptionally) because on newer Macs (I tested on
two, one haswell and one Mac Pro) the CPU auto detection fails and
formula install aborts. Also if we would force a certain TARGET, the
logic for that would be quite complicated. Further, the test did not
pass on a haswell based system. I hope this does not break other
software Homebrew/science.
openblas: Need to add version number explicitly
maker: Add DOI
opencv: add options --with-tests, --without-openexr

Force brewed libs for all dependencies. Style cleanup.
samtools: update dwgsim to 0.1.11

Closes #801.
allpaths-lg: fix url
octave 3.8.1: optional GUI & JIT
Fix for odd mkoctfile dependency issues
X11/TeX fixes
EXPERIMENT: stripping out extra link dependencies in mkoctfile, to see if it fixes the pkg problems.
Removed the keyboard patch for HEAD builds; added mkoctfile patch, pstoedit/epstool dependencies
Further remove unnecessary link dependencies in mkoctfile.