[MERGE] portal,project,website_*: move portal code

This merge mainly does 2 things:
- move frontend chatter feature from website_mail
into portal, since chatter is required for some
business model in the customer portal. This chatter
is still also responsible of displaying comments
for website object (slides, blog, ...)
- bring project customer portal into project,
and make project module depends on portal, like
it was already done for sale and account.
hr_timesheet now contains the dislaying of timesheet
on task in portal.

website_project is removed, and we do not use
website.published.mixin on project, since this
is only used to display its rating. projects are
not public object.

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