ui: use I/O descriptors internally and as a result: - fix webproto to redirect the ui descriptors instead of sys.stdout/err - fix sshserver to use the ui descriptors

dispatch: add I/O descriptors to the request

ui: add I/O descriptors

import: add --bypass option This feature is more a way to test patching without a working directory than something people asked about. Adding a --rev option to specify the parent patch revision would make it a little more useful. What this change introduces is patch.repobackend class which let patches be applied against repository revisions. The caller must supply a filestore object to receive patched content, which can be turned into a memctx with patch.makememctx() helper.

import: separate parents selection from working dir update This will be useful when patching without updating the dirstate

patch: extend filtestore to store an optional copy source This will help wrapping filestores in memctx.

paper/coal: use fixed width for diffstat +/- link The plus and minus characters are normally not the same width in a non-monospace font, and this made the line length change when the diffstat display was toggled. The square brackets are not rendered in a monospace font to ensure that they align with the parenthesis on the same line.

hg: rename opts argument to peeropts in clone This should make it clearer that the options are used with remoteui only and are not used otherwise in hg.clone.

hg: move peerschemes back to schemes This will avoid breaking things with extensions until peers are fully separated from repos.

hg: rearrange peer scheme lookup There is now only peer scheme lookup. Repository lookup goes through peer scheme lookup. When peer and repo types are finally separated, repo lookup will use peer.local() to get a repository object. The underbar is dropped so that extensions can patch the table.