version option returning clone branch name

[wdjoyner]

The attached patch adds to version an option which returns the version and the branch clone name.
New behavior:
sage: version()
returns exactly the same thing it did before no change.
sage: version(True) # or replace "True" by anything except "0" or "False"
returns
(Version, Branch name)
For example,

sage: version(1)

('SAGE Version 3.0, Release Date: 2008-04-22',
 'Mercurial clone branch: version')

in a Mercurial clone branch created using "sage -clone version".

Component: user interface

Issue created by migration from https://trac.sagemath.org/ticket/3047

[wdjoyner]

comment:1

This ticket should be deleted. I meant only to create trac 3046.