The Blitz++ dependence has been entirely removed.  The lapack.h and .cpp files have
been stripped back to only use the relevant diagonalization routines.
The DM in entropy.h has been modified to a c-style array compatible with the lapack diagonalization.

In this version, the code outputs the DM, plus eigenvalues/vectors in lapack.cpp.  This output was tested
against the previous version on saskeram.cmt.uwaterloo.ca, and output was identical
(using ./2dEE.out -i 4x4square.dat)
Merge branch 'master' of https://github.com/MelkoCollective/NLC_Heis_Bilayer