freetalk: catcher_handler() segfault fix
ssl: SSL should be disabled by default, enable per login
extensions: tabs and other cleanup
freetalk: Rework across the code

- Gettext related changes avoid using "po" directory
- remove old argp related code add support for `argp-standalone`
- remove legacy broken code 'file_transfer.{c,h}'
- Do not expose jabber registration code, TODO
doc: Update URL's
build: build related fixes