form start resets globals, RemoveLines is default

When the Remove Lines form opens the globals it uses are reset to 0.

The Remove Lines button on the Remove Lines form is now the default
button and should accept enter
Added custom form for PO entry
Binary Update
Added PO entry form
Removed SaveThis test sub
Implemented btnOk_Click
Fixed bug in frmGetPO
Fixed bug in PO number in frmGetPO
Various bugfixes
Renamed button subs and added comments
Added check to see if all POs exist
Various bugfixes
Implemented form terminate and added cancel
Changed order of frmRemove OK/Cancel buttons
Incremented version