pre-build libraries for Julia packages and create default git config

Build and install native dependencies of bundled Julia packages in base image. Reduces build time and space requirement for Julia packages (Dockerfile v13).

Also generating a default git config for users on first login. 

That looks like more of a problem with MPI than BLAS. I wish distributions would stop trying to link Ipopt to the MPI version of MUMPS, since Ipopt is not an MPI-parallel application. @ghorn