Updated tutorial codes to compile on develop branch.
Removed some unused accessors from HubbardChain MPO builder.
Updated exthubbard.cc sample code to compile after removal of Quiet() Opt helper function.
Updated ExtendedHubbard.h to use new Model interface and changed design of kinetic energy part.
Removed using namespace std; in all .cc files in favor of more specific using statements to avoid conflicts with boost.

Fixed conflicts:
	itensor/itensor.cc
Removed using namespace std from option.cc
Updated sample and sandbox codes to no longer use removed Opt creator functions
Added support for iDMRG to J1J2Chain
Allowing S- and S+ in addition to Sp and Sm in spin Models. Added S2 (S squared) operator to both.
Update utility.cc

Fixed error: expected unqualified-id before ‘__extension__’
 static Complex I(0.0,1.0), C1(1.0,0.0),C0(0.0,0.0);
                ^
utility.cc:453:16: error: expected ‘)’ before ‘__extension__’
with PLATFORM=lapack
Update lapack_wrap.h

Added support for Lapack on GNU/Linux systems by using LAPACKE header (C interface to Fortran Lapack)
Update options.mk.sample

Added support for Lapack libraries (C interface) on GNU/Linux distributions.
Fixed out-of-date comment
Moved recently added endif to just below initial ifdef I