Remove support for BlueGene
These systems are nearly at end of life, and are starting to be
decommissioned. Plus regressiontests haven't passed since about
version 5.1.
Accordingly, QPX SIMD is no longer supported, since only the
BlueGene/Q A2 cores implemented it.
Our cpuinfo code can still detect this platform, because that
does no harm, but we now fall back to GMX_SIMD_ACTIVE=None.
Docs and build system have been updated accordingly.
There is an aspect of the Verlet scheme that was originally
implemented for BlueGene/Q (namely simd_interaction_array), but this
is now also used by the no-SIMD build, so remains in the code.
Change-Id: I1a680671bfab56f94d9fadb2e8f751ba429e5894
33 files changed: