[IMP] project,project_issue: follow tasks and issues that are ready for the next stage
[FIX] website: Odoo's social URLs
[FIX] website: typos
[REM] db_manager: remove old dependencies to datejs and timepicker and replace by momentjs
[IMP] website_forum: better implementation of automatic nofollow attribute
on links in forum posts.

This is now done when creating / updating posts instead of updating the display
of the post. This means that old posts may contain nofollow attribute altough
the user has sufficient karma; however it is acceptable compared to the computation
we save by avoiding processing every post to display.
[IMP] ir.attachment : move the fields index_content (from document), mimetype and datas_checksum (from website) to base. In base, the mimetype is computed with the Magic python lib (if installed, else with a custom function using magic number), and the index_content is an implementation of strings unix command. In document, index_content is still computed with the indexer of document module.
[FIX] typo in odoo.py

Fixes #4203
[IMP] mail : add compose mail button on top menu to send private emails
[FIX] number of blogs by month according to blog/tags
[IMP] website.theme: close the modal when the user click outside or press escape
[MERGE] squash-merge of odoo-dev/master-i18n-fp
[FIX] fields: in field description, return True when translate is a callable
[FIX] ir_model: in ir.model.fields, name is not translatable, but field_description is
[FIX] translate: discard removal of function _push
[FIX] translate: remove nonsensical code
[FIX] ir_translation: fix function field 'source' when field.translate is not True
[FIX] ir_translation: when loading translations, convert types 'field', 'help', 'view' into 'model'
[FIX] ir_translation: add specific methods to retrieve translations of field string and help
[FIX] ir_translation: pass lang explicitly when loading field translations for ormcache consistency
[IMP] models: improve reflection of fields into ir.model.fields

* add missing columns in base.sql
* add missing fields 'help', 'readonly', 'required', 'selectable' in reflection
* add field 'help' in ir.model.fields views
* do not patch registry with translated field string and help upon ir.model.fields update