Option: PSGW CLEAR AMIS EXCEPTIONS

This option loops through the "AEX" - exceptions cross-reference in the
AR/WS Stats File - 58.5.  Drugs in this cross-reference had data
missing from the Drug file at the time the quantity was dispensed,
and thus could not be added to the cumulative AMIS statistics.
For the selected date range, the drug will be shown, and the user
will be asked to supply the missing data.  At that time, the routine
will update the AMIS statistics, and delete the "AEX" cross-reference.