• Fix the code that matches userids in match_jobspec(). It needs to check the username-for-accounting field (P), not the username-for-headerpage (L). These are usually the same value, except that control files do not have the username-for-headerpage field if the user has requested no header page.
• Also rename the cji_username field to cji_headruser, to make it clear that the value should only be used for the header page. (aka banner page)

MFC after: 3 weeks