censor: add censor command to hgext with basic client-side tests The censor command is a core extension which can replace the contents of a historical file revision with a censor "tombstone" which can be exchanged with older clients in place of the real revision data. The command rewrites the filelog by copying revision-by-revision. Care must be taken to expand the fulltext of the children of the censored revision before copying them to the new filelog; they might be stored as deltas against the uncensored revision, and those deltas will be invalidated. For more background on the censorship feature design, see: http://mercurial.selenic.com/wiki/CensorPlan

--- a/tests/test-help.t	Fri Mar 13 14:08:30 2015 -0700
+++ b/tests/test-help.t	Sun Mar 15 21:52:17 2015 -0400
@@ -245,6 +245,7 @@
        acl           hooks for controlling repository access
        blackbox      log repository events to a blackbox for debugging
        bugzilla      hooks for integrating with the Bugzilla bug tracker
+       censor        erase file content at a given revision
        churn         command to display statistics about repository history
        color         colorize output from some commands
        convert       import revisions from foreign VCS repositories into