sundials: add features

Add:
- serial tests for C bindings
- all patches found from sundials mailing list since 2.5.0 release
- OpenBLAS support
- Fortran bindings
- serial tests for Fortran bindings
- MPI support
- parallel tests for C bindings
- parallel tests for Fortran bindings
- additional patches (submitted upstream) not on the mailing list that fix latent bugs
- mirror
- `without-accelerate` option