Correct LineGrouping build errors and fixed QuadFinder bugs

Fixed QuadFinder findClosestPnt.
Fixed bug in findClosestPnt
Added comments for QuadFinder::getQuads()
Added display functions for quadrilaterals.

Added displayQuad and displayQuads functions.
Added and fixed findIntercepts

findIntercepts now correctly identifies vertical lines.
Added testing code.
Added logging to parameters.
Added functionality to write the quad image with parameter list.
Merge pull request #9 from larsjangaard/QuadFix

Quad fix