commands.import: accept a prefix option
The --prefix option is meant to be relative to the root rather than the current
working directory. This is for consistency with the rest of 'hg import' --
paths in patches are otherwise considered to be relative to the root.
In upcoming patches we'll hook this option up to the patch functions.
--exact with --prefix is currently disallowed because I can't really come up
with sensible semantics for it, especially when only part of the patch is
preserved.
Mercurial
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