added ability to test total error (sum of error for epsilon and finiteness...

added ability to test total error (sum of error for epsilon and finiteness mismatch) and corrected imshow method to keep original images in the same range when directed)

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@124 8a9318a1-56ba-4d59-b755-99d26321be01