Changed dmrg function to pass opts down to MPS svdBond method.
Added boost:: namespace to shared_ptr methods to avoid ambiguity with C++11 std library.
Removed experimental and incorrect TraceReIm option from diag_hermitian method of SVDWorker.
Improved DMRGObserver output (prints entropy and more digits of eigs)
Added more QN info to IQTensor printout. Removed fermion parity from QN printout (just look at whether Nf is even or odd).