Changeset 899 for sans/Dev/trunk/NCNR_Help_Files

Changed all reference to "NGA" to "NGB" in hte reduction code and in SASCALC. Hopefully I've gotten everything. Most places were in stringswitch where I keyed on all three characters, so NGA dropped down to NGB with the correct result. Put placeholders in for the same behavior for "CGB" which will be the new name for NG3 after it moves, whenever congress allows.

Added Matt's description of the Rescaled Axis panel to the Analysis help file.