Renabled building of pack_test.
Added ColorSpinorField::volumeCB to prevent clash with LatticeField::volumeCB.
Small fixes and cleanup for pack_test.
Added zeroCopy variant of device packing for cpuColorSpinorFields (disabled by default).  Fixed bugs related to copying half precision cpu fields (never used actually used).
Bug fix: all color_spinor_field_order.h load/store methods are index safe.
Bug fix: all color_spinor_field_order.h load/store methods are index safe.
Merge branch 'master' of github.com:lattice/quda