merge: stable heads I forgot to pull before rolling rc1, so we just have a couple of patches that missed the rc1 train. Mea culpa.

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relnote: mention a nodemap bug fixes The fix was in a3720569a43f. Differential Revision: https://phab.mercurial-scm.org/D10499

relnote: document the use of persistent-nodemap by default for Rust build Differential Revision: https://phab.mercurial-scm.org/D10498

relnode: document the move to `zstd` as default compression Differential Revision: https://phab.mercurial-scm.org/D10497

relnote: clarify the backward compatibility entry about p1/p2 swap The previous message might read a bit scary. So we clarify that the nodeid are not affected. Differential Revision: https://phab.mercurial-scm.org/D10496

mail: add a TODO about proper mbox locking Per @nbjoerg in IRC, the mbox isn't locked correctly. Differential Revision: https://phab.mercurial-scm.org/D10505

packaging: extract pre-computed version when running from plain tarball The tarballs created by setup.py are not including the usual archive markers that `hg archive` leaves, so the rewrite of the version number computation actually left the empty version string around. This meant that installations from PyPI would use 0.0.0 as version string. Differential Revision: https://phab.mercurial-scm.org/D10502

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