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20130810 (Saturday, 10 August 2013)
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Added new field `body_template` to :class:`modlib.notes.Note`.

This is similar to 
the `email_template` field of
:class:`lino.modlib.outbox.models.MailableType`.

Moved the `list_templates` function from 
:mod:`lino.modlib.outbox.models`
to :func:`lino.core.web.list_templates`.

:mod:`lino.core.web` had a function called `web_setup` 
which I renamed to :func:`site_setup <lino.core.web.site_setup>`.
:mod:`lino.core.web` might become a plugin.

Converted all :meth:`lino.core.model.Model.row_summary` 
methods so that they return a sequence of html elements and not 
a string.