other def_body_html and def_body_text to change to body_html and body_text

Tree is up to date at revision 3663 of branch http://bazaar.launchpad.net/~openerp/openobject-server/trunk
Tue Sep 27 16:00:15 CEST 2011

def_body_text => body_text
def_body_html => body_html
generate_mail => send_mail

to add some tests for text and HTML
Added the html href support

coherence control.

First project version. This is just a stub that adds the boolean use_tracker to the marketing campaign activity and then overrides the email launching. The real work will begin now :)