hidden: Add a hiddenrevs attributes to changelog.
This attributes hold the set of all revisions that should be ommited by command
and tools displaying changesets.
This set is given as a hit. Command and tools are responsible to check it in
order to filter they outpur.
Code adding revisions to the set are responsible to the consistency of it's
data.
http://mercurial.selenic.com/bts/issue1438
$ "$TESTDIR/hghave" symlink || exit 80
$ hg init
$ ln -s foo link
$ hg add link
$ hg ci -mbad link
$ hg rm link
$ hg ci -mok
$ hg diff -g -r 0:1 > bad.patch
$ hg up 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg import --no-commit bad.patch
applying bad.patch
$ hg status
R link
? bad.patch