wireprotov2: change behavior of error frame
Now that we have a leading CBOR map in command response frames
to indicate overall command result status, we don't need to use
the error response frame to represent command errors. Instead,
we can reserve it for protocol and server level errors. And for the
special case of a command error that occurred after command response
frames were emitted.
The code for error handling still needs a ton of work. But we're
slowly going in the right direction...
Differential Revision: https://phab.mercurial-scm.org/D3386
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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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
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See https://mercurial-scm.org/ for detailed installation
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