Fixed half precision naive staggered (need to set fat link max to 1.0).
Added new solver parameter option use_sloppy_partial _accumulator for setting whether to use high or low precision for accumulating the partial solution vector in solvers.
Texture class is now more robust for different precision combinations.
Added support for high precision accumulator for CG solver and staggered fermions.
Updated staggered solver example for high precision accumulation.
Merge branch 'tifr-redux' of github.com:lattice/quda into tifr-redux