Improved Markdown formatting of INSTALL.md file.
Improved robustness of options.mk.sample file. Now strips whitespace out of USE_CPP11 value and issues an error if USE_CPP11 undefined or set to any value besides yes or no.
Added a check for negative prime level.
Partial work on adding features to Spectrum class.
Expanded features of Spectrum class and added ability to construct from tensors containing singular values.
Merge branch 'spectrum'
Commented out printing in spectrum_test.cc
Made IQIndexVal and IndexVal no longer subclasses of IQIndex and Index. This design was leading to confusing behavior when trying to construct an ITensor from one or more IQIndexVal (which are often used by the SiteSet classes). Added some related unit tests.
Renamed primed to prime in tutorial/02_two_site
Updated 02_two_site/imag_tevol code to use newer conventions; added some more comments.
Slight change to 03_svd tutorial.
Minor cleanup of tutorial/05_DMRG
Removed code causing compilation bug when using boost foreach.
Fixed a type definition causing compilation error in spectrum.cc.
Fixed a C++11-only line of code in new idmrg.h header.
add missing standard library includes
Fixed for compilation with ACML and gcc 4.8.2
Merge branch 'SDepenbrock-master' to include pull request #62
Merge branch 'master' of github.com:jgukelberger/ITensor

Fixed Conflicts:
	itensor/global.h
	utilities/cppversion.h
Added check for diagonal tensors to Spectrum