This changes quite a bit to the way the editing functions work. Because
these functions are very repetitive and it's easy to keep things out of
sync, I created a script to generate them automatically. I had to rename
a few function and table names for consistency to make this work.
Since database entries don't have a 'latest' column anymore, and since
the order in which tables are updated doesn't have to be fixed, I
dropped many of the SQL triggers and replaced them with a
edit_committed() function which is called from edit_*_commit() and
checks for stuff to be done.
Don't forget to run 'make' before importing the update script.