Revert "h5py: New package, version 2.3.1"

This reverts commit 3c6afb34967a241e2c2e106cb02bad55b5389b94.

Doesn't build.
Revert "mpi4py: New package, version 1.3.1"

This reverts commit 63c062947eb765e4a02bc892e1891da7057fdfec.

Doesn't build.