D3665: graph: improve graph output by using Unicode characters

[quark (Jun Wu)]

quark added a comment.


  Maybe I should change cmd.exe font. But here's what I got pasting the text into the console:
  
  F103261: cmd.png <https://phab.mercurial-scm.org/F103261>

REPOSITORY
  rHG Mercurial

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

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