- Added a new button to the chatter that displays the amount of
attachments on the current record and when clicked, all the attachments
attached to the current record
- added mail.FormView (includes), used by the chatter attachment
button to fetch the field value of attachment_count.
- added a computed field "attachment_count" to mail.thread that
contains the amount of attachment attached to the record.
- changed the followers div, it is now sharing a "right side"
area with the attachment button.
task: 1860031