added a "kupu_save" log entry on saving.
Thus we - as wiki admins - will be able to:
 gather stats on kupu editor usage
 proactively go to all kupu-edited pages to check for damage, and
get user feedback
The patch just add a line
&TWiki::Store::writeLog( "kupu_save", "$_.$_", "" );
While I sympathise with the goal, I don;t want to do this for two reasons:
- There is no writeLog method in TWiki::Func, so I'd have to call the core directly
- It's easy for an admin to add this if it's really important to them; otherwise it's just code bloat.