extensions: reject any unicode strings in tables before loading This allows us to test hg on Python 3 without disabling third-party extensions which could pollute cmdtable for example.

py3: make test-extdiff.t pass on Python 3

py3: make regexp patterns bytes in extdiff

py3: fix bytes-unicode dance while building docstring of extdiff

py3: factor out byterepr() which returns an asciified value on py3

remotenames: don't use the default value of logfmt for namespaces logfmt is the format which is used to format the log output for that namespace. This patch passes "remote {bookmark|branch}: %s" as the logfmt. Space is not added after bookmark and branch to make output consistent with other details. Still this is not the best output. We may need to wrap getlogcolumns() to change spacing in the in built columns to match the remotenames one. lognames are also deleted as they are superseded by logfmt. Differential Revision: https://phab.mercurial-scm.org/D2277

py3: whitelist test-pull-http.t There's a lot of work left to do on network-related stuff, but I at least got one more test passing. Differential Revision: https://phab.mercurial-scm.org/D2296

scmutil: bytes-ify IOErrors before wrapping them in abort message Differential Revision: https://phab.mercurial-scm.org/D2292

py3: port f to Python 3 This involved a lot of b'' literals, conversion from %s to %d, and using a hashing mechanism that returns bytes instead of str. Differential Revision: https://phab.mercurial-scm.org/D2299

py3: replace file() with open() in test-convert-git.t file() is not present in Python 3. It also makes sure we write bytes on Python 3. Differential Revision: https://phab.mercurial-scm.org/D2133