Initialize shared-repository to maintain several branches

Any developer wishing to periodically track and/or commit to the siesta code base is encouraged to use the "shared repository" format of bzr.

To conform with the siesta maintainers you should follow these steps to create a shared repository.
In the following we will follow a recipe for creating a new siesta shared repository:

1. Create folder to contain the root shared repository:
   mkdir siesta
2. Make bzr aware of the directory as a shared repo:
   bzr init-repo --pack-0.92 siesta
3. Go into the siesta folder and branch of the trunk, and possibly any other branch you wish to keep locally:
   # create the trunk version and call it "trunk", the first branch will take "forever" to create
   bzr branch lp:siesta trunk
   # create the 4.0 release series and name it 4.0, this will be much faster to create
   bzr branch lp:siesta/4.0 4.0
keep adding branches until you have those you need.

Basically these steps ensures a single repository for maintaining a shared commit log for shared repositories. Please see this webpage for further details on the advantages:
   http://wiki.bazaar.canonical.com/SharedRepositoryTutorial

Now your work-flow is much faster as branching of is a shared action.

* This need not be empty, however, we strongly advice you to do so until you fully understand the implications of the actions in bzr.