changed version number; refactored delta.diff to correct ignore mask interaction bug and also returned more comprehensive data to simplify other code; added more stats for min/max values from both data sets; documented investigation of connic projection plotting issues; _create_mapped_figure now finds it's own bounding axes; fix data existance mismatch bug on trouble plot; added filtering functions for lon/lat and var data; added range display control for plots; cut back on process prolifferation to (hopefully) limit how often I cause systems to thrash wildly with large data sets; also smaller bug fixes

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@47 8a9318a1-56ba-4d59-b755-99d26321be01