Currently, tags created using the "create tag" dialog in gitk are
always lightweight tags, i.e., they don't have any annotation
(message). This enables the user to specify a message; if they do,
gitk will create an unsigned, annotated tag object.
Signed-off-by: David Dulson <dave@dulson.com> Signed-off-by: Paul Mackerras <paulus@samba.org>