Bug 10723: Merge GetPendingOrders and SearchOrders routines

Bug 10723: Merge GetPendingOrders and SearchOrders routines

In the C4::Acquisition module, 2 routines do the same work. This patch
merges these 2 routines.

Test plan:
test the acqui/orderreceive.pl, acqui/uncertainprice.pl
and serials/acqui-search-result.pl, acqui/parcel.pl scripts.

Note: on acqui/parcel the basket filter is a search on basket name (was
on basket id, which was not relevant).

Signed-off-by: Pierre Angot <tredok.pierre@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Passes koha-qa.pm, no adverse bahaviors noted. All sub calls updated.

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