extdiff: remove dir2root and pass full path as dir2 in _runperfilediff() The only use of `dir2root` was to join with `dir2` to generate the path for other side of diff. Like in previous patch, `dir1a` and `dir1b` are full paths and no longer base names, hence we pass `dir2` as full path too and making `dir2root` unrequired. Differential Revision: https://phab.mercurial-scm.org/D8970

extdiff: pass full paths of `dir1a` and `dir1b` to `_runperfilediff()` Earlier we were passing basename instead of the fullpath and then joining with the tmproot. This is wrong because the user can choose `rev1a` as wdir and in those cases, tmproot should not be joined with the path. I am working on refactoring extdiff logic so that we can have options like `diff --tool` and encountered this. Although this patch in itself makes no difference, however in future when a new caller of `_runperfilediff()` will be added, it will be useful to directly pass on the full paths instead. Differential Revision: https://phab.mercurial-scm.org/D8969

hgweb: compatibility of hgweb.cgi template with Python 3 When running Mercurial on Python 3 hgweb expects the config variable to be a bytestring. The solution proposed by Anton Shestakov is to use a byteprefix to the literal string defined cgi script as provided in this patch for hgweb.cgi, contrib/hgweb.fcgi and contrib/hgweb.wsgi. I am not sure whether this covers all relevant templates, but I couldn't find others. Differential Revision: https://phab.mercurial-scm.org/D8978