D1532: color: respect HGPLAINEXCEPT=color to allow colors while scripting (issue5749)

[durin42 (Augie Fackler)]

durin42 added a comment.


  In https://phab.mercurial-scm.org/D1532#26006, @xalep wrote:
  
  > You could also add `color` to the list of values described for `HGPLAINEXCEPT` in mercurial/help/environment.txt
  
  
  Nice catch, thanks!

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D1532

To: durin42, #hg-reviewers
Cc: xalep, mercurial-devel