[MOV] mail: moved files according to the new module organization

addons/mail/__init__.py

addons/mail/__openerp__.py

addons/mail/data/mail_group_demo.xml

addons/mail/models/__init__.py

addons/mail/models/html2text.py

addons/mail/models/ir_actions.py

addons/mail/models/ir_attachment.py

addons/mail/models/ir_ui_menu.py

addons/mail/models/mail_alias.py

addons/mail/models/mail_followers.py

addons/mail/models/mail_group.py

addons/mail/models/mail_mail.py

addons/mail/models/mail_message.py

addons/mail/models/mail_message_subtype.py

addons/mail/models/mail_template.py

addons/mail/models/mail_thread.py

addons/mail/models/res_config.py

addons/mail/models/res_partner.py

addons/mail/models/res_users.py

addons/mail/models/update.py