added features to plot figures individual; to control threading for memory clean up; new filter to allow limit data to bounds; > 1,000,000 trouble pts now plot as a contour; new glance library functions

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@83 8a9318a1-56ba-4d59-b755-99d26321be01