2008-04-08  Philip Withnall  <philip@tecnocode.co.uk>

        * configure.ac:
        * data/diary.ui:
        * src/Makefile.am:
        * src/main-window.c:
        * src/main.c:
        * src/main.h:
        * src/storage-manager.c:
        * src/storage-manager.h: Add encryption support for the database, with
        full backwards-compatibility for the old database filename. Also make
        sure to save the current entry on quitting.