Bug 19792: Performance boost for GetBudgetHierarchy

Bug 19792: Performance boost for GetBudgetHierarchy

This patches reduces the number of SQL calls by combining multiple calls to the recursive functions GetBudgetSpent(), GetBudgetOrdered(), etc. into 4 big queries.
It also removes duplicate function calls from acqui-home.pl

Test plan:
0) Visit Acquisition home
0) Apply patch
1) Refresh page. It shoud look identical.
2) prove t/db_dependent/budgets.t

Signed-off-by: Jon Knight <J.P.Knight@lboro.ac.uk>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jon Knight <J.P.Knight@lboro.ac.uk>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>