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docker: clean up travis dockerfile, add README #1914
This PR removes the dependencies manually added by past PRs to
I've also added a
While working on this I found that MPI tests were being skipped in the CentOS builds because
Problem: The CentOS 7 mpich-3.0 package does not install into a usable location by default, and requires the environment-modules command 'module load mpi' to enable. Since we don't run this anywhere in our build scripts, the MPI tests were silently being skipped. In travis_run.sh, source /usr/share/Modules/init/bash if it exists and attempt to `module load mpi` so that mpicc can be found by configure.