merge with i18n

i18n-pt_BR: synchronized with 802dffd62de5

filelog: censored files compare against empty data, have 0 size To support "status" operations against working directories that are the children of censored revisions, filelog must define "cmp" and "size" for censored content.

filelog: raise CensoredNodeError when hash checks fail with censor metadata With this change, when a revlog revision hash does not match its content, and the content is empty with a special metadata key, the integrity failure is assumed to be intentionally caused to remove sensitive content from repository history. To allow different Mercurial functionality to handle this scenario differently a more specific exception is raised than "ordinary" hash failures. Alternatives to this approach include, but are not limited to: - Calling a hook when hashes mismatch to allow arbitrary tombstone validation. Cons: Irresponsibly easy to disable integrity checking altogether. - Returning empty revision data eagerly instead of raising, masking the error. Cons: Push/pull won't roundtrip the tombstone, so client repos are unusable. - Doing nothing differently at this layer. Callers must do their own detection of tombstoned data if they want to handle some hash checks and not others. - Impacts dozens of callsites, many of which don't have the revision data - Would probably be missing one or two callsites at any given time - Currently we throw a RevlogError, as do 12 other places in revlog.py. Callers would need to parse the exception message and/or ensure RevlogError is not thrown from any other part of their call tree.

error: add CensoredNodeError, will be thrown when content deliberately erased This change introduces the error plus a corresponding catch in dispatch, to provide localized error messages. The verb "censor" is used in this commit and all following to refer to erasing the content of a revlog revision (filelog, for now) without recalculating node IDs, leaving that revision invalid. Further work must be done to safely share such revision data with compliant clients. I find the analogy to censorship straightforward; for less politically charged options, consider "erase", "excise", "expunge", or "blackhole".

files: cache repo.dirstate For a large repo, 'hg files' goes from 2.27 seconds to 1.92.

files: only check for removed, not unknown or missing ctx.matches() doesn't return unknown files, and repo.dirstate[f] never returns '!' for an answer.