Bug 11551: Add unit tests for using GetHistory to search by order number

prove t/db_dependent/Acquisition.t should return green.

Signed-off-by: remy juliette <juliette.levast@iepg.fr>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 11551: Allow to search on parent ordernumber in histsearch.pl

It is now possible to search on the order number on the order search
page.

Also searching on parent_ordernumber is possible, allowing one to
search to search children for a given order number.

Test plan:
1/ create a basket and 1 order with at least 2 items.
2/ receive partialy the order (receive only 1 item).
3/ note that a new ordernumber is created for item not received.
4/ go on the order search form and search for the original ordernumber
without checking the new checkbox "Display children too." => only 1
order (the parent) is displayed.
5/ now check the checkbox and search again => the parent order is
displayed but children too.

Signed-off-by: remy juliette <juliette.levast@iepg.fr>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works nicely, passes all tests and QA script.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 11551: (follow-up) standardize label of order number / order line

This patch changes the label of the order number search field
on the order search form from "Order no." to "Order line", to make
it consistent with how the order number is referred to in other
parts of acquisitions.

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