vfs: Fix deprecation warning in Python 3.10 (issue6520) Differential Revision: https://phab.mercurial-scm.org/D10710

contrib: fix typo I forgot to fix it in flight, this commit will do fine.

revlog: rename `indexdata` to entry_data Same reasoning as the previous changeset, we might not be looking at index data here. Differential Revision: https://phab.mercurial-scm.org/D10602

revlog: use "entry_point" phrasing for loading the revlog The main entry for the revlog will not necessary be the index, but a small "docket". So we change the variable names and we move the initialisation of the index_file and data_file after that first entry point have been read. Differential Revision: https://phab.mercurial-scm.org/D10601

revlog: directly use self._format_flags when loading index The shorthand variable does not bring much, so we drop it to simplify the code. Differential Revision: https://phab.mercurial-scm.org/D10600

revlog: directly use self._format_version when loading index The shorthand variable does not bring much, so we drop it to simplify the code. Differential Revision: https://phab.mercurial-scm.org/D10599

revlog: use `_format_flags` to access flags instead of `header` It seems better to reuse the variable we carefully extracted This also open the way to more flexible way to retrieve these flags. Differential Revision: https://phab.mercurial-scm.org/D10598

revlog: rename `newversionflags` to `new_header` This make it consistent with the previous changeset. Differential Revision: https://phab.mercurial-scm.org/D10597