git-gui: Add support for adding remotes

When a remote is being added, it can also be automatically either fetched
or initialized and pushed; this patch adds capability for initializing
of local and ssh repositories. This also of course leaves a lot of space
for further customization features, like individually turning the
initialization phase on/off or tuning attributes of the remote
repository; I consider that out of scope of this patch, however.

Signed-off-by: Petr Baudis <petr.baudis@novartis.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

git-gui.sh

@@ -2448,6 +2448,10 @@ if {[is_enabled branch]} {
 if {[is_enabled transport]} {
 	menu .mbar.remote
 
+	.mbar.remote add command \
+		-label [mc "Add..."] \
+		-command remote_add::dialog \
+		-accelerator $M1T-A
 	.mbar.remote add command \
 		-label [mc "Push..."] \
 		-command do_push_anywhere \