hgweb: Respond with HTTP 403 for disabled archive types instead of 404
This makes it easier for clients/users to distinct between supported
but disabled and unsupported archive types.
created new head
% local deleted a file, remote removed
abort: outstanding uncommitted changes
resolving manifests
removing a
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
(branch merge, don't forget to commit)
% should show a as removed
R a
% manifest. should not have a:
b