D3138: rebase: make "destnode" consistently a revnum and rename it to "destrev"

[quark (Jun Wu)]

quark accepted this revision.
quark added a comment.


  Thanks. I was not too happy about the old code using `rev` as `node`s. But I didn't spend much time changing them.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3138

To: martinvonz, #hg-reviewers, quark
Cc: quark, mercurial-devel