Bug 27287: Make note fields from orders history searchable

Bug 27287: Make note fields from orders history searchable

This patch adds aqorders.order_internalnote and
aqorders.order_vendornote to the Acquisitions history search.

To test:
1) Apply patch and restart services
2) Create an order in Acquisitions and set an internal note and a vendor note
3) Go to /cgi-bin/acqui/histsearch.pl and search by internal or vendor
note using the terms you set in step 2
4) Note your order is returned and internal note and vendor note are
included in the search results at the end of the table

Sponsored-by: Bibliotheksservice-Zentrum Baden-Wuerttemberg
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>