Add mercurial to development group?

[Neal Becker]

Bill Nottingham wrote:

> Rex Dieter (rdieter at math.unl.edu) said:
>> fyi, comps is in git now, instructions are referenced in the
>> aforementioned document.
> 
> ... and mercurial's already an optional package there. Or is this
> a request to make it a default one?
> 
> Bill

IMO, mercurial should have the same status as git.  git is default.  Should 
we take a vote?