py3: use '%d' for integers instead of '%s' Python 3 does not allow using "%s" for integers. This makes the test works on Python 3. The test still does not pass because there is a deprecation warning. Differential Revision: https://phab.mercurial-scm.org/D4696

py3: add b'' prefixes in tests/test-bdiff.py This makes the test close to passing # skip-blame because just b'' prefixes Differential Revision: https://phab.mercurial-scm.org/D4695

py3: fix kwargs handling in hgext/absorb.py This fixes couple of tests on Python 3. There is only one absorb test left failing on Python 3. Differential Revision: https://phab.mercurial-scm.org/D4694

filelog: stop proxying headrevs() (API) The previous commit removed the last user of this method. It is redundant with heads() and adds little to no value other than convenience. Let's nuke it. Differential Revision: https://phab.mercurial-scm.org/D4663

hgweb: use heads() instead of headrevs() These appear to be the only callers of headrevs() on file storage objects. Let's port to heads() so we can remove headrevs(). Differential Revision: https://phab.mercurial-scm.org/D4662

filelog: record what's using attributes filelog and the file storage interface have some attributes that ideally shouldn't be there. This commit annotates some of those attributes with their users so we know where to look when it comes time to removing them. This exercise exposed a theme: many attributes are used by LFS, repo upgrade, verify, and special repo types (like bundlerepo). That points to missing abstractions on file storage to facilitate these special needs. Differential Revision: https://phab.mercurial-scm.org/D4661

filelog: stop proxying datafile (API) It appears the censor code was the last user of this proxy. With there being a dedicated censor API, we can drop the proxy. Differential Revision: https://phab.mercurial-scm.org/D4660

filelog: stop proxying _addrevision() (API) There are no callers of this API in core. And I'm not sure why this proxy was added in the first place, as the commit that added it (1541e1a8e87d) didn't appear to have any callers in the repo either. Who knows. Differential Revision: https://phab.mercurial-scm.org/D4659