[GNC] Lightweight multi-user enhancement suggestion

[David G. Pickett]

It occurred to me that, once a save has been completed, gnucash could delete the lock file.  This would allow either another user of networked files or a botch run for finance quotes to update the file.  If the running original gnucash goes to modify his memory or display a new page or report, a flag can tell it that it deleted the lock, and so check the age of the file and reload if necessary before creating a new lock file.  This is a lot of functionality and not a lot of code to get file sharing.