Added new configuration setting "country" to set a default country

for the site.  If this is set then user menus are pre-selected.
eg when signing up or filling out profile after external authentication.

lib/defaults.php

@@ -21,6 +21,7 @@
        "proxyhost"        => "",
        "proxyport"        => "",
        "maxeditingtime"   =>  1800,
+       "country"          => "",
        "guestloginbutton" =>  1
     );