Separate PETSc and HDF5 install in custom portabilities

[kwabenantim]

Summary

PETSc and HDF5 have historically been bundled together in custom Chaste portability builds for better mutual compatibility with MPI. However, recent versions of PETSc, HDF5, and MPI do not seem to have retained the compatibility issues that prompted this design choice. Ongoing work to modernise the Chaste CMake infrastructure will follow the approach of locating these dependencies separately (see Chaste#408 for example).

For these reasons, it would be useful to unbundle the PETSc and HDF5 installations in custom Chaste portability images.

TODO

• Separate PETSc and HDF5 build scripts.
• Update https://chaste.github.io/docs/dev-guides/developer-install-guide/
• Rebuild custom portability images
  • portability-dev
  • portability-01
  • portability-02 (wontfix)
  • portability-03
  • portability-04
  • portability-05 (wontfix)