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pycompat: custom implementation of urllib.parse.quote()

urllib.parse.quote() accepts either str or bytes and returns str.

There exists a urllib.parse.quote_from_bytes() which only accepts
bytes. We should probably use that to retain strong typing and
avoid surprises.

In addition, since nearly all strings in Mercurial are bytes, we
probably don't want quote() returning unicode.

So, this patch implements a custom quote() that only accepts bytes
and returns bytes. The quoted URL should only contain URL safe
characters which is a strict subset of ASCII. So
`.encode('ascii', 'strict')` should be safe.

Mercurial
=========

Mercurial is a fast, easy to use, distributed revision control tool
for software developers.

Basic install:

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

Running without installing:

 $ make local      # build for inplace usage
 $ ./hg --version  # should show the latest version

See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.