Simplified implementation of HermitianEigenvalues in matrix/utility.cc. Combined two loops in svd.cc
Removed a buggy optimization in ITensor +=. Also added a helpful comment before multSiteOps.
Fixed some aspects of MPS reading and writing to disk. Copying an MPS now works with doWrite()==true. Calling doWrite(false) after doWrite(true) now copies back tensors from disk. doWrite accepts Option WriteAll to force immediate writing of all tensors.
Merge remote-tracking branch 'origin/master'