status: disable morestatus when using -0 Without this patch, you get something like this: ``` M a\x00? a.orig\x00# The repository is in an unfinished *merge* state. (esc) # Unresolved merge conflicts: # # a # # To mark files as resolved: hg resolve --mark FILE # To continue: hg commit # To abort: hg merge --abort ``` That doesn't seem like something one would ever want. I considered making it an error to combine `-0` with morestatus, but it seems very likely that that would just make the user spend time trying to figure out how to disable morestatus, so it feels like we might as well just do it for them. Differential Revision: https://phab.mercurial-scm.org/D9545

debugdiscovery: display some information about the initial "undecided" set The size and shape of the revision that remains "undediced" once the fetched the remote heads and queried the local one have a large impact on the discovery performance, so we display some information about that set. Differential Revision: https://phab.mercurial-scm.org/D9530

debugdiscovery: add some data about the shapes of the sets We display the number of heads and roots or the common and missing set. Differential Revision: https://phab.mercurial-scm.org/D9529

tests: conditionalize the progress timestamp for Windows It looks like for py2 on Windows, the start date is 1970. It matches the other platforms for py3, so I'm just going to match the tests and move on, given that py2 is on the way out. Differential Revision: https://phab.mercurial-scm.org/D9541