Remove all remaining GParamSpec name and blurb strings (and fix
indentation while we're there), and add G_PARAM_STATIC_STRINGS to all
paramspecs that were lacking it.
NmtMacEntry would allow you to input 1 character more than it should
have. Fix that.
Also, the code to insert ":"s automatically was bumping against some
weirdness in NmtNewtEntry that made it so that the ":" didn't get
displayed until you typed one more character after the one where it
got inserted. Hack around that by manually requesting a redraw.
https://bugzilla.gnome.org/show_bug.cgi?id=731160