[ADD] fields: add option to store binary fields into attachments

Such a field is declared as:

    image = fields.Binary("Image", attachment=True)

With this option, the value of a binary field F is stored in an attachment with
`res_field=F`.  When attachments are stored into the filestore, binary fields
are consequently stored in the filestore as well.  Note that the option does
not work on old-API function fields.

By default searching on `ir.attachment` filters out attachments for binary
fields: the condition `res_field=False` is added to the domain unless a
condition on field `id` or `res_field` is already present.  The client uses
`search_read` with a domain like `[('id', 'in', ids)]` for reading the data on
a form view.  In that case, we should not filter out attachments that store
binary fields.

Also, do not filter search results for the superuser.

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