lfs: drop deprecated remote store config options The last of these were removed from fb-experimental in 86884a51e9aa, and we might as well clean this up before the freeze.

py3: use bytes instead of pycompat.bytestr Follow up for 35fb3367f72d. Differential Revision: https://phab.mercurial-scm.org/D1854

test-pull-r: explicitly kill server processes Differential Revision: https://phab.mercurial-scm.org/D1855

bookmarks: add bookmarks to hidden revs if directaccess config is set This patch adds support to add bookmarks to hidden revs if `experimental.directaccessi=True` config is set. A warning is also printed saying "accessing hidden changeset <revhash>". Differential Revision: https://phab.mercurial-scm.org/D1813

visibility: pass a normal repo to _getfilteredreason There is no reason to pass an unfiltered-repo to _getfilteredreason and successorssets, so use a normal repo instead. Differential Revision: https://phab.mercurial-scm.org/D1853

visibility: make the filtered message translatable Introduce a filtered message table to ease translation of these messages. Differential Revision: https://phab.mercurial-scm.org/D1852

visibility: fix a comment introduced before which is not up-to-date 265cd9e19d26 introduced a comment in _filterederror that was not updated with the latest iterations of the patch, fix the comment. Differential Revision: https://phab.mercurial-scm.org/D1851

rust: avoid redundant 'static lifetime 'static is apparently automatic for const variables. Differential Revision: https://phab.mercurial-scm.org/D1846

pull: hold wlock for the full operation when --update is used With now, the wlock is not held between the pull and the update. This can lead to race condition and make logic checking to post pull results more complicated (eg: with _afterlock).

hgweb: drop support of browsers that don't understand <canvas> (BC) Internet Explorer 8 and below need excanvas aka ExplorerCanvas to support canvas tag at all. We used to vendor the library in Mercurial, but IE8 was discontinued and all support for it ceased in January 2016. We should do the same and remove excanvas library. Apart from just cleaning up code, this will also make downstream Debian packages stop depending on libjs-excanvas, for example.