rhg: stop shadowing `exit` function This will be useful for the next patch which needs it.

config: add alias from `hg help rhg` to `hg help rust` This will make using `rhg` more user-friendly and features more discoverable.

rhg: add `config.rhg` helptext This will make using `rhg` more user-friendly and features more discoverable.

config: fix indentation of some`share-safe` options This makes the output much more readable.

perf-unbundle: do a quick and dirty fix to make it run on more commit Without this change, the perf commands fails within the f67741e8264b::18415fc918a1 range (boundary excluded). Check inline comment for details. With this fix, the command is able to run on this range, with a slightly different behavior (as no revset is "uninlined"). However this is still much better than not being able to run anything in this range. Especially because that range do see some performance regression for unbundle.

perf-unbundle: pre-indent the main block in per::unbundle This makes the next changeset clearer.

shelve: handle empty parents and nodestoremove in shelvedstate (issue6748)

rhg: fallback when encountering ellipsis revisions Ellipsis revisions are still experimental and buggy in non-trivial histories. We currently have no plans to improve this situation nor to add support for ellipsis revisions in `rhg`. Falling back should be done carefully (since we may have already done some work that is visible to the user), but in this case it's highly unlikely that we're doing anything useful with a repo with ellipsis revisions, so this should be strictly better, also since the error message is more explicit.

dirstate-v2: hash the source of the ignore patterns as well Fixes the test introduced in the last changeset. This caused the hash to change, which means that the check in the test had to be adapted. Since this hash is only done as a caching mechanism, invalidation does not pose any backwards compatibility issues.

dirstate-v2: add test that shows a collision in ignore patterns hash This hash is used for optimizing dirstate `status`. We demonstrate that the hash is incorrectly ignoring the changes to the semantics of the ignore files just because the contents (but not their source) haven't changed. This is fixed in the next changeset.