share: move config item declarations into core These config items control share behavior that is implemented in core. Since the functionality is implemented in core, extensions may leverage it. Mozilla has one such extension. And, it needs to access share.pool. Before this patch, a devel warning regarding accessing an unregistered config option would be issued unless the share extension were loaded. Moving the registration of the config options to core fixes this.

morestatus: don't crash with different drive letters for repo.root and CWD Previously, if there were unresolved files and the CWD drive was different from the repo drive, `hg status -v` would page the normal status, followed by the exception header. A stacktrace was waiting when the pager exited. The underlying cause was the same as f445b10dc7fb. Unfortunately, I don't see any reasonable way to write a test this [1]. [1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-November/107401.html

pathutil: add doctests for canonpath() This is a followup to f445b10dc7fb. Since there's no way to ensure that more drive letters than C: exist, this seems like the only way to test it. This is enough to catch the f445b10dc7fb scenario, as well as CWD outside of the repo when the path isn't prefixed with path/to/repo.