tests/test-revert-unknown.t

revlog: improve documentation of the entry tuple

The code in revlog, and outside revlog directly use the index's entry tuple,
with direct integer indexing. This is a voluntary trade off to obtains better
performance from the  Python code at the expense of the developers sanity.

Let's at least have a clear and central documentation about what this tuple is
about.

Differential Revision: https://phab.mercurial-scm.org/D10643

  $ hg init
  $ touch unknown

  $ touch a
  $ hg add a
  $ hg ci -m "1"

  $ touch b
  $ hg add b
  $ hg ci -m "2"

Should show unknown

  $ hg status
  ? unknown
  $ hg revert -r 0 --all
  removing b

Should show unknown and b removed

  $ hg status
  R b
  ? unknown

Should show a and unknown

  $ ls -A
  .hg
  a
  unknown