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errors: make formatparse() an instance method on ParseError

Authored by martinvonz.

Description

errors: make formatparse() an instance method on ParseError

It's just a little simpler this way.

Don't ask me what the "hg: " prefix signifies to the user, I just left
it as it was. I think we should consider changing the prefixes later
(maybe always use "abort: ", or maybe use more specific prefixes in
general).

Differential Revision: https://phab.mercurial-scm.org/D9347