thread affinity now uses some topology information

thread affinity now uses some topology information

The order of logical cores on x86 is hardware and software dependent.
The cpuid topology reports this and this information is now used.
The mdrun -pinht option is generalized for SMT to -pinstride.
The mdrun -pinoffset option is now in logical (iso phyiscal) cores.
Thread-MPI no longer sets affinity, it's now all done in one place.
The option -pin is now an enum, default auto: only on when using all
cores and when no external affinity has been set.
A big NOTE is printed with auto when no pinning is used.
Option -pin on can now override thread affinity set outside mdrun.
Fixes #1122
All thread affinity code has been moved from runner.c to
gmx_thread_affinity.c.
Updated the mdrun manual for pinning also active without OpenMP.

Change-Id: Ibf0fe5882688de80c223640502c68e6170d4d044