tests/test-debugrename.t

hidden: move hiddenrevs set on the repository

This set is always accessed through the repo for now. Having this set
carried by the changelog make it complicated to:

- initialize it, computing hidden set may involve revset call
- lazy compute it, (1) only the changelog can detect someone access it,
                   (2) only the repo have enought knowledge to compute it.

In later version I expect he changelog to apply filtering itself and the set to
be carried by changelog again.

  $ hg init
  $ echo a > a
  $ hg ci -Am t
  adding a

  $ hg mv a b
  $ hg ci -Am t1
  $ hg debugrename b
  b renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3

  $ hg mv b a
  $ hg ci -Am t2
  $ hg debugrename a
  a renamed from b:37d9b5d994eab34eda9c16b195ace52c7b129980

  $ hg debugrename --rev 1 b
  b renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3