rebase: remove bogus nullmerge check in updatebookmarks nstate[v] is a node, not an int, and the nullmerge check was done while building nstate anyway.

share: backout fd903f89e42b, except the test Locating the share source when no default path is available is now handled in subrepo._abssource(), so unconditionally setting a default path (and the associated problems) can be avoided. The test change reflects the fact that a default path is no longer set on the resulting share.

subrepo: use sharepath if available when locating the source repo This is an alternative fix for issue3518, enabling sharing of repositories with subrepos, without unconditionally setting the default path in the resulting repo's hgrc file. Better test coverage is added here, but won't prove this code is working until fd903f89e42b is backed out. The problem with the original fix is, if a default path is not available to be copied over from the share source, the default path on the resulting repo is set to the source location. Since that's where the actual repository is stored, the path is essentially self-referential, so push, pull, incoming and outgoing effectively operate on itself. While incoming and outgoing make it look like nothing was changed, push currently hangs (see issue3657). In this case where there is not a real default path, these operations should abort with "default(-push) not found", like the source repo would. Note this problem with the original fix affected repos without subrepos too.