added ability to restrict histogram range in histogram plotting function; this is all wired up to the inspection report (put histogram_range in the config file to use it); changed set_to_value_between_bounds filter to set_to_value_outside_bounds and wrapped old name for compatibility

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@198 8a9318a1-56ba-4d59-b755-99d26321be01