D4156: narrow: add a --narrowspec flag to clone command

[spectral (Kyle Lippincott)]

spectral accepted this revision.
spectral added a comment.


  In https://phab.mercurial-scm.org/D4156#64662, @durin42 wrote:
  
  > I'm +1 on this, but I'd like someone else to chime in. @spectral how do you feel about this? It's at least somewhat related to functionality we've added via aliases, right?
  
  
  I've wanted it a few times; I don't think we have any aliases to do it though, so I'm +1 on it as well.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D4156

To: pulkit, durin42, #hg-reviewers, spectral
Cc: spectral, mercurial-devel