Update julia and some of its dependencies
Split PCRE because a lot of packages depend on it and I am not sure we
want to test them in a hurry (and Julia specifies exact version).
Linking octave with clapack did not work.
I updated lapack, and additionally I build it with atlas, instead of blas. That should give
better performance. I don't know if atlas builds everywhere though.
On the other hand, maybe some programs linking with liblapack will fail. We'll have to check
the hydra reports.
I plan to remove clapack; liblapack provides a C interface too.
svn path=/nixpkgs/trunk/; revision=32464
