adding extra checks when variable data is loaded to prevent crashing and some cosmetic changes to html report output

added global and variable attributes to report pages; fixed bug in the io module that was causing global attributes to never be loaded; corrected the behavior for purple marking circles behind small numbers of mismatch points and added that behavior to some other kinds of mismatch plots

adding a new density scatter plot and putting limits on how much data glance will be willing to plot in traditional scatter plots and hex plots

moving the reports and some other things I missed the first time around to use the new constants module

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@203 8a9318a1-56ba-4d59-b755-99d26321be01

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@183 8a9318a1-56ba-4d59-b755-99d26321be01

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@180 8a9318a1-56ba-4d59-b755-99d26321be01

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@152 8a9318a1-56ba-4d59-b755-99d26321be01

moved to new version to represent the gui change; marked glance no longer zip safe due to mako needing to search directories for templates; moved glance non-code files into the stuff subdirectory; overhauled report generation to remove copied code; more kinds of files can get all variable attributes using io; checked in initial imapp idea plotting code; set up initial stats window in gui; added numeric validation to some gui input fields; changed the statistical analysis constructors to allow for direct use of data objects

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@151 8a9318a1-56ba-4d59-b755-99d26321be01