adding support for correcting AWIPS data type distortion on load; note this...

adding support for correcting AWIPS data type distortion on load; note this isn't yet hooked up to the outer methods in compare

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@209 8a9318a1-56ba-4d59-b755-99d26321be01