fix for using Muffle in parallel
bug fixes and cleanup in MEH
When building Gamma matrices in MEH-RAS, tasks now look ahead to check whether terms will contribute BEFORE computing them. Also reorganizing code base so MEHRAS and MEHDistRAS use the same “next block” function.
Move spin_decontaminate out to the whole Dvec (so it can be parallelized).
circumventing buggy code