[MERGE] Mail/Portal fixes and tests.

Mail: fixes
- fixed employee user not allowed to invite people on documents (see bug lp:1075501)
- fixed a crash using email template in mass_mail mode without choosing a template (see bug lp:1078702
- fixed user not allowed to read mail_message displayed in their mailbox because of mission notification
- fixed user not allowed to read ir_attachment linked to displayed messages but without read access on the related document
- fixed design of mail.group that was inherits'ing from ir_ui_menu; removed the inheritance but added an explicit link and menu management inside mail_group
Portal:
- limited res_partner read access on their own partner for portal group members
- fixed access rights of group portal members for various models (based those defined for employees)
Misc:
- refactored a bit the various tests, now splitted in several files
- cleaned and updated tests about mail_message and Chatter flow
- more tests are using an employee instead of administrator to trigger access rights issues
- improved the tests related to mail in portal
- removed unused files of deprecated models mail_vote, mail_favorite

lp bug: https://launchpad.net/bugs/1075501 fixed
lp bug: https://launchpad.net/bugs/1078702 fixed

bzr revid: tde@openerp.com-20121214124410-jt18ai8ltw1h2xeo

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