Fixed bug related to priming Condenser objects.
Added support for multiple targeting and complex eigenvalues to davidson method.
Improved OptSet string constructor to remove any whitespace from string before processing.
Added option for turning off Sz conservation in Hubbard Model class.
Updated sample codes to use latest InitState interface.
Added Nupdn to list of Hubbard default ops and added definition for S2
Added missing include of std algorithm in option.cc
Removed Opt generating functions in favor of OptSet string constructor.
Added S2 to list of default Hubbard ops.
Fixed bug in DMRGObserver where measurements of operators didnt include ortho center on first half sweep
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