Forward dec for source update function

Signed-off-by: Sharif Olorin <sio@tesser.org>
Check if a source tag is valid

Signed-off-by: Sharif Olorin <sio@tesser.org>
That's a terrible forward decl

Signed-off-by: Sharif Olorin <sio@tesser.org>
More forward decls for sources

Signed-off-by: Sharif Olorin <sio@tesser.org>
Tests for source tag validation

Signed-off-by: Sharif Olorin <sio@tesser.org>
Remove obsolete reference broker implementation

Signed-off-by: Sharif Olorin <sio@tesser.org>
More manpage stubs

Signed-off-by: Sharif Olorin <sio@tesser.org>