- Added textures for clover inverse field.
- Added functions to bind/unbind the new textures.
- Added variables for the clover inverse fields in the DslashParam structure.
- Added the classes DiracTwistedClover and DiracTwistedCloverPC, copied from twisted mass.
- Added the file dirac_twisted_clover.cpp, which should describe the aforementioned classes.
Revert "- Added textures for clover inverse field."

This reverts commit 2ed00a61e2baca1290698eda905246972b1a42ff.
Added check to make sure the gauge-force kernels ignore paths with
zero coefficients.
- Merged modifications of the clover inverter from the tifr-redux branch
Merge remote branch 'origin' into tmclover-quda
Merge branch 'tmclover-quda' of github.com:lattice/quda into tmclover-quda