fixes bug with inversions with a negative twisted mass mu
removed mu paramter in clover_inv and H_eo_sw_inv_psi, hmc working again
typo fixed
mu added as parameter for clover_inv again to catch mu==0 case
Merge pull request #267 from urbach/fixCloverInv

fixes bug in invert with a negative twisted mass mu combined with clover
Merge remote-tracking branch 'upstream/master' into InterleavedNDTwistedClover