Where is stored description for Emacs branches layout?

[Oleksandr Gavenko]

I visit:

  http://savannah.gnu.org/bzr/?group=emacs

where next link was referenced:

  http://bzr.savannah.gnu.org/lh/emacs/

It show Emacs branches.

How can I get same info only with bzr command line client (please no bzr
explorer or another gui)?

Another question which branches stand for?

Sometimes it is obviously: concurrency, emacs-23.

Sometimes not. Where the latest sources in 'trunk' or in 'emacs-24'?

What are:

 * profiler
 * python
 * xwidget
 * elpa

branches stand for? Where is description?

-- 
Best regards!