Get master building for now

This reverts commit 9f311bbc

Previously shared libraries were linked using the unwrapper compiler (so MPI special flags didn't work)

Tidy up so that both trees use the same library dependencies

It is probably the case that the -x<code> option from AX_CC_MAXOPT is sufficient to get AVX support

Updated author list, configure script to display whether libNUMA was found and install instructions. Also moved to version 0.2.0 since we have multi-timestep.

Don't see much difference in my simple tests..., LLVM support is not checked

* This is not vectorisation-specific.
* There may be better trade-offs between HT and NUMA.
* Maybe print a warning when we require multiple NUMA nodes.
* Must also detect when Hyper-Threading is not present.
* Probably better as a configure flag, rather than conditional only upon
  the availability of libnuma.
* ~15-40% performance improvement on COSMA.

This reverts commit 144739bd.

Added a simple unit test example. Test can be run using 'make check' and new tests are added by editing tests/Makefile.am


Former-commit-id: 40f040fbc4575da0d40f3bb3968bd988351499e6