hgweb: refresh repository using URL not path (issue4323) hgweb detects out-of-date repository instances (using a highly suspect mechanism that should probably be fixed) and obtains a new repository object if needed. This patch changes the repository object copy to use the repo URL (instead of path). This preserves more information about the source repository and allows bundles to be served through hgweb. A test verifying that bundles can now be served properly via `hg serve` has been added.

obsmarker: add `date` as an explicit field The markers are now 5-item tuples (concluded by the date). The obsstore.fields contents have been updated accordingly. There is no change to the on-disk format yet, so the date has to be extracted every time we read binary markers and re-injected each team we write them. This introduces a slowdown that will be solved when a new version of the format is added. Such a slowdown was already introduced by the evolve extension anyway.