D3665: graph: improve graph output by using Unicode characters

[johnstiles (John Stiles)]

johnstiles added a comment.


  OK, I've fixed the latest nits in this diff, as well as changing the circle characters as discussed to:
  
  U+25CB	○ <- changeset
  U+25CC	◌ <- obsolete (as before)
  U+25CD	◍ <- active

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3665

To: johnstiles, #hg-reviewers
Cc: indygreg, smf, yuja, mercurial-devel