Bug 9416: add new order vendor note field

Bug 9416: add new order vendor note field

Currently, there is a single note field in each order. It would be
useful to have 2 notes fields:

- one for the staff (ex: "catalog this book as soon as possible")
- one for the vendor (ex: "urgent", "only the 2d volume"...), which
  could later be printed in basketgroup pdf for example

This patch adds a new note made for vendor in each order. The existing
note is renamed "internal note".

The behavior of the 2 notes are the same

Changes in database structure:
- new column aqorders.order_vendornote
- column aqorders.notes renamed aqorders.order_internalnote

To test :
[1] Make a complete acquisiton process (creating the order > looking at
    the basket > looking the order > receiving); and try to use the 2
    notes (internal note / vendor note)
[2] Check the changes made on one page (eg detail of the order) are
    saved and visible on an other page (eg receipt page)

Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Testing notes on last patch.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>