[MERGE] converts buttons in form views into 'stat buttons'

This branch converts pretty much every buttons in 'stat buttons',
which means buttons that can display any kind of information.  Right
now, it is mostly used to display a numerical information (such as a 
number, for example 9 Calls).  Also, look at the invoices button in 
Customers form view for an example of a functional field, displaying
the total amount invoiced.

The stat buttons also supports sub widgets, for example a mini pie chart
or a mini bar chart.  Examples of such sub widgets can be found in 
marketing/mass mailings form views (not ready yet)

bzr revid: ged@openerp.com-20140502144544-c5j7bzlm9i4clv4l

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