corrected dslash_test.cpp for the non-degenerate twisted mass
Merge remote-tracking branch 'origin/quda-0.7' into gpu_comms_debug
fixed svd stopping criterion
Corrected HP bug in fused exterior domain wall kernel, which now works
for all precisions although cleanup is required.
4D fused domain wall kernel now works. Cleanup required.
DW cleanup.
Cleaned up the fused DW kernel code.
Merge remote-tracking branch 'origin/quda-0.7' into gpu_comms_debug