Merge pull request #6 from CVerhoosel/master

New LibMatrix functionality
remove Precon object
Compiling and running, but NON-working version of applyconstraints
Working version of applyconstraints MINUS diagonal terms
Working version except for diagonal
Added diagonal entries to constraints operator
Merge branch 'master' into constraintmatrix

Conflicts:
	libmatrix.py
Merge pull request #7 from CVerhoosel/constraintmatrix

Constraintmatrix