prep work
fix bug when user specifies same cont variable for slider 2 and colour by
modified the dotplot calculations to use counts like the histogram does to avoid the scaling issue; also stack them nicer for small counts
remove dev. bug
added ability to specify plot title
Fix a bug introduced when making the g1/g2 matrix.
Fix bug introduced when fixing dotplot.
removed old code
Merge branch 'master' into g2matrix