Bump version
    
    Overview of changes:
    
     *  Added subcommand level tab completion
    
        Saturnin v0.5.2 brings in long-awaited support for subcommand tab
        completion.  These are some basic scriptlets; there is space to
        improve but they are already helpful.
    
     *  bmo-be now creates status overview files
    
        Ideal for conky-like displays, bars and even shell prompts,
        bmo_be.sh now keeps two files that can be read to keep brief status
        (SXPR).
    
     *  Fixed meta.url variable in bmo-mka templates
    
        Saturnin v0.5.1 added app-url parameter, so now we can make use of
        it and have the meta.url variable actually contain something.
    
     *  Added bmo-menu command to list all menus
    
     *  Cleaned up and improved bmo_be.sh, mostly internally
    
     *  Smaller updates, cleanups and fixes