revset query builder for hglib

[Idan Kamara]

I'd like to implement some kind of revset query builder for hglib, here's
what I had in mind:

>>> import revset as rs

>>> rs.branch('default')
<revset: "branch('default')">

>>> rs.branch('default') & rs.range('1.5') & ~rs.merge()
<revset: "branch('default') and '1.5':: and not merge()">

>>> rs.head() & ~rs.closed()
<revset: "head() and not closed()">

>>> rs.sort(rs.date('May 2008'), 'user')
<revset: "sort(date('May 2008'), user)">

>>> (rs.keyword('bug') | rs.keyword('issue')) & ~rs.ancestors(rs.tagged())
<revset: "(keyword('bug') or keyword('issue')) and not ancestors(tagged())">

It will handle quoting, and generally be less prone to typos.
It might not be as concise as raw strings, but I think it's nice.

Real usage within hglib might look like this:

repo = hglib.connect(...)
repo.log(rs.branch('default') & rs.tagged())
vs
repo.log("branch(default) and tagged()")
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