server: allow customizing the default repo filter hgweb has the (undocument) configuration option web.view that allows restricting visible revisions to immutable. This is useful for serving the same storage as publishing and non-publishing repo. Add the new server.view option to serve the same purpose by changing the default behavior of `getdispatchrepo`. Drop the hard-coded 'served' filter in the batch handler of v1 of the wire proto, this is a left-over from the days before `getdispatchrepo` existed. Differential Revision: https://phab.mercurial-scm.org/D5946

py3: convert filtername to str if it's None I have not called pycompat.bytestr() and rather converted the value there because I am starting to get concerned about the function call overhead of all this bytes to str or vice versa convert functions. Differential Revision: https://phab.mercurial-scm.org/D6042

walkfilerevs: rename filerevgen() to filerevs() since it's not a generator Differential Revision: https://phab.mercurial-scm.org/D6053

global: use raw string for setlocale() argument Otherwise Python 2 will coerce a unicode to str, which fails on HGUNICODEPEDANTRY=1. Differential Revision: https://phab.mercurial-scm.org/D6052

encoding: use raw strings for encoding arguments This prevents the internals of Python from coercing a unicode to str on Python 2 and makes tests run with HGUNICODEPEDANTRY=1 a lot happier. Differential Revision: https://phab.mercurial-scm.org/D6051

revsetlang: use sysbytes() instead of blind encode() Otherwise we will call str.encode() on Python 2, which is wrong. sysbytes() does encode('utf-8') on Python 3. But the source is guaranteed ASCII, so it shouldn't matter. With this change, `hg` now runs with `HGUNICODEPEDANTRY=1` set. However, several tests are failing. Differential Revision: https://phab.mercurial-scm.org/D6050