hg-git and git tags handling

[Abderrahim Kitouni]

Hi,

Since the recent tag cache code broke my initial attempt at handling git tags
in hg-git (using something like the bookmarks extension), it's now time
to start thinking of a better solution. It was broken anyway since it didn't
allow git tags to be shared between hg repositories.

git tags aren't version-controlled (as they aren't supposed to change), and in
this respect they are very similar to hg bookmarks.

Any ideas on this?

Regards,
Aderrahim