[FIX] document: display Attachment(s) menu only on form view

The attachment menu (list and add) has no effect in tree view (not supporting multi-items upload and display), the menu should then only be displayed in these view (opw 612534)
[FIX] sale: keep page when confirming a sale order

To keep the pager and view changer after confirmation of a sale order, do not reload the view (quotation and sale order view are the same anyway)
Fixes #250
[MERGE] forward port of branch 7.0 up to 59b76ee