Log Message:
Updated to 0.7.6

Changes:

     * Undo/Redo now works, with an unlimited history. Large amounts of
        the program was rewritten to allow this.

     * Allow clicking beyond the end of the fragment of text, to make
       it easy to select past the end of a line.

     * Improvements to the "Required Child" dialog to use Glade and be
       more HIG-compliant (David Hoover).

And more bugfixes, etc.