- Reworked Insert command so that it leaves the inserted text selected.
 - Set focus to .editor.text on open file.
 - Added "replace_all" function (and command and menu item).
 - Added "recent files" view to database schema.
I _THINK_ I've fixed the problems with false positives on detecting unsaved changes.  However, Tcl/Wish is sometimes segfaulting, and the undo operation sometimes locks up the UI.  Hmm...
Forgot to comment out the debugging messages!