Fixes #554. PROG: The IsisAml, GuiComboBoxParameter, and GuiListParameter...

Fixes #554. PROG: The IsisAml, GuiComboBoxParameter, and GuiListParameter classes have been modified so that they look for an exact match of a list or parameter value when trying to match the user's input to the GUI interface

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@4862 41f8697f-d340-4b68-9986-7bafba869bb8