[TYPO] project_issue: efficiantly --> efficiently
[CLEAN] website_event_track: cleanind / migration to new api of the module
- removed event.tag and event.track.stage models
- cleaning / linting
- fixed kanban view of tracks
[FIX] web_tip: better event handling

* Override message_fetch from mail.Thread in a dedicated limk module (mail_tip)
and fire an event when the messages are loaded. This is necessary for tips on
the chatter.
* Override render_value form web.form.FieldStatus: Call reposition() when a
FieldStatus object is done rendering.
* Tip.reposition() method
* Handle web bus resize event
[IMP] Option to permit custom dump for backup

This improvement is necessary for future migrations.

It permits the user to get the original PostgreSQL custom dump that we
use to have until version 8.0.