[FIX] website_sale: cleaned call to removed methods in website_sale

Add field sequence on the delivery.gird.line to order rules
Add condition quantity to add more flexibility in the rules
Add operators > and < to be able to create rules without gap (instead of needing hack like 'x <= 100', 'x >= 100.000001')

Fixed checkout redirection that was meant to clean the session (incorrect sale order or transaction) that may happen
when having issues with the payment.

MERGE [IMP] website_forum: make forum.forum inherit from mail.thread. This way we add the possibility to users to follow a forum and be automatically followers of new questions, using some new subtypes on the forum.forum model that do the auto subscription.

Misc :

also added a profile link on the forum, when logged.
also added a subscribe button on the forum.

add the possibility to users to follow a forum and be automatically followers of new
questions, using some new subtypes on the forum.forum model that do the auto subscription.

Also added a profile link on the forum, when logged.

Also added a subscribe button on the forum.

[FIX] base_gengo: use supported/up-to-date library

[FIX] If no addons-path provided, include the main addons [Fixes #29]

Seperate web.assets_common from other bundles

- scholar: the field is_correct is on the answer, not on the question
- remove closing reason 'an answer was accepted', the questions should be left as open to be possible to improve the answer afterward
- sort badges by most frequent first
- display the creation date of the question the same way we display the answer date

[FIX] remove closing reason 'an answer was accepted', the questions should be left as open to be possible to improve the answer afterward

Automatic auth='user' redirection for unlogged users

[FIX] website_forum: when sending emails about forum post, use the public url instead of the private

Also added a breadcrumb in partners navigation; when going on the partner view
a link to come back to the list view has been added and takes into account
selected grade and country.

opt out with query parameter ?noredirect=1