Just to relay a comment that I made on #14144. The IPython update broke 
branch printing and nobody noticed for a while. So I removed it. There are 
a number of ways to find out the branch very easily:

* Just "hg branch", without even starting Sage
* Look at the devel/sage symlink
* From within Sage: hg_sage.current_branch()

In general, making the banner depend on the configuration will break the 
sage<->sage interface and doctests occasionally. So there is a clear cost 
involved in printing extra stuff during startup. Though if you still think 
that it is important to print the current branch during startup then we can 
reinstate the old behaviour (until we switch to git).


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