Removed spurious fused_output file.
Updated lib/Makefile so that 'make gen' generates the wilson fused
dslash kernels.
Modified lib/generate/dslash_cuda_gen.py so that it doesn't generate
twisted mass kernels (previously, it generated kernels that were overwritten).
Now using the twisted-mass kernels generated by deg_tm_dslash_cuda_gen.py only.
Merge remote branch 'origin/quda-0.7' into quda-0.7