tests/test-debugindexdot.t

revset: changed minrev and maxrev implementations to use ordered sets

Performance Benchmarking:

0) max(tip:0)
1) min(0:tip)
2) min(0::)

b96cb15ec9e0 (2.9.1 release)

    0) ! wall 0.005699 comb 0.000000 user 0.000000 sys 0.000000 (best of 450)
    1) ! wall 0.005414 comb 0.010000 user 0.010000 sys 0.000000 (best of 493)
    2) ! wall 0.025951 comb 0.030000 user 0.030000 sys 0.000000 (best of 107)

05267e6e94dd (public tip at submission time)

    0) ! wall 0.015177 comb 0.020000 user 0.020000 sys 0.000000 (best of 175)
    1) ! wall 0.014779 comb 0.010000 user 0.010000 sys 0.000000 (best of 189)
    2) ! wall 12.345179 comb 12.350000 user 12.350000 sys 0.000000 (best of 3)

Current patches:

    0) ! wall 0.001911 comb 0.000000 user 0.000000 sys 0.000000 (best of 1357)
    1) ! wall 0.001943 comb 0.010000 user 0.010000 sys 0.000000 (best of 1406)
    2) ! wall 0.000405 comb 0.000000 user 0.000000 sys 0.000000 (best of 6761)

Just exercise debugindexdot
Create a short file history including a merge.
  $ hg init t
  $ cd t
  $ echo a > a
  $ hg ci -qAm t1 -d '0 0'
  $ echo a >> a
  $ hg ci -m t2 -d '1 0'
  $ hg up -qC 0
  $ echo b >> a
  $ hg ci -m t3 -d '2 0'
  created new head
  $ HGMERGE=true hg merge -q
  $ hg ci -m merge -d '3 0'

  $ hg debugindexdot .hg/store/data/a.i
  digraph G {
  	-1 -> 0
  	0 -> 1
  	0 -> 2
  	2 -> 3
  	1 -> 3
  }

  $ cd ..