Removed redundant size() method from IndexSet (just use r() instead).
Removed a few unused or redundant methods from IndexSet and QN.
Fixed minor issue where IQCombiner wasn't auto-determining arrows properly.
Improved printout of QNs in IQTensor (added commas in between).
Replaced some MPOt overloads with simple calls to the parent (MPSt) method with an addition Opt. Changed MPSt::orthogonalize to reset orthogonality bounds before calling position(N). Renamed the confusing addNoOrth to addAssumeOrth.
Merging Steve's latest changes into my repo.
Cleanup of some debugging code.