allow user to email puchase orders from journal in PO History

PO History will let you go through the motions of emailing a PO from JOUR-PO, just the same as if the PO were in PO-MASTER. However, no email is sent. This is to prevent the PO from being inadvertently emailed to a vendor a 2nd time, causing it to be double-ordered. No message is displayed to the user saying that the email cannot be sent for this reason, which leads them to contact DDMS support to find out why they are not receiving their email.

If the PO is in a journal, the user should receive a prompt noting "PO has been journalized/completed, continue sending email?". After clicking "Yes", the PO should email the same as if in PO-MASTER.