Reset anisotropy to correct value of 2.38 for dynamical fields
MG levels set to 3.
Merge branch 'multigrid' of https://github.com/lattice/quda into multigrid
Added support for free-field tests of multigrid with nvec=2
Merge branch 'multigrid' of https://github.com/lattice/quda into multigrid
Changed the null vectors used for unit gauge field for testing purposes.