Minvoice changes
	
2.180821
Streamlined item entry.
Calling for an invoice in use by a window brings the window forward.
Updated some icons.
Added a page number on longer invoice printouts.
Subtotals buttons added in the invoice and invoice line item list windows
 
2.160425
Fixed enabling buttons in the invoice entry window.
Changed invoice entry window to show more items.
Changed invoice entry window to show and hide cost and profit.
Allow displaying multiple invoice and line item windows.
All close window actions except for the Cancel button will accept changes.
Allow hiding and selecting highlighted records in list forms.