Purge Invoices
	
	The purpose for purging the O/E files is to keep the current (working) files
	more compact, which decreases searching time also. Depending on your requirements,
	it is recommended that you keep the previous month of invoices, to all since the
	first of the year. With regular archiving, you can always access older invoices
	from the history file.

	Purge means remove the invoice and its line items from the Current (working)
	files.

	Only shipped invoices and those that have been updated to the G/L
	may be purged. 
	
	New with Greux, if an invoice has not been archived (not in History),
	it will not be purged either.

	Also new with Greux, an invoice may be purged even if it hasn't been flagged as 
	printed. If you need to print it, do it from the history files.

	Invoices or quotes with no transactions are automaticly purged.
	
	Recurring invoices (1st 5 chars of Salesperson field = RECUR) cannot be removed
	unless the word DELETE is somewhere after RECUR in the salesperson field.