[REM] : remove wizard of schedule/log a call ,
[IMP] : Rename in Opportunity and in Partner form the 'Meeting' into 'Schedule a Meeting' ,
[FIX][IMP]: fix traceback and imp code for hide schduledcall menu
[IMP]: Test case
[MERGE]: with trunk
[IMP]: Rename Hide scheduled call menu to Show scheduled call menu because by default menu is hidden
[FIX]: traceback when create a calls
[IMP]: help
[IMP]: Link lead/oppo with newly created calls , using call button
[IMP]added access rights for manager and user in hr_recruitement and project module.
[MERGE]with latest.
[FIX] account: while refuding the invoice with payment term journal items are created wrongly with write-off account
[MERGE]with latest.
[IMP] Mail Improvements
[MERGE]: Merged with addons
[IMP]website_partner: Replace none with never in notification email send field.
[IMP] mail, email_template: mass mailing feature cleaning
- now differentiates mass mailing and mass post.
- mass mailing is a true mass mailing
- using same_thread log a copy in the document, without using message_post
(using notification field, + model and res_id)
- improved form view of composer, adding a filed explaining a bit the various
recipients
- removed unnecessary fields coming from the template (partner_to, ...) because
they are confusing -> composer should be easier to understand and use
- removed some unnecessary code
- removed double body computation when using templates (one for tmeplate, then
the wizard -> not necessary)

This commit will be followed by other to try to improve the mass mailing
and mass post.
[MERGE] Sync with trunnk
[IMP] mail, email_template: still continuing work to improve performances of mass mailing.
main differences :
- record_name is not a function field anymore, but a char field + a method in create
if not given (default-like, but dependent of other values). This allows the composer
to give a value for record_name (False for email mass mailing) to avoid browsing
records and having their access rights issues in the way
- author_id, email_from coming from composer instead of called in every mail.message
creation
- moved code dealing with attachments from send_mail to get_mail-values, to that at
the end of this method we know all values of the email

Some tests have been updated / temporarily disabled.
[MERGE] Sync with trunk
[CLEAN] email_template: cleaned modified code to lessen the diff