Bug 14132: suggestions table is missing indexes

Bug 14132: suggestions table is missing indexes

Suggestions table is missing some indexes.

Index on biblionumber will speed up C4::Suggestions::GetSuggestionInfoFromBiblionumber(), often called in a loop.
Index on status and branchcode will speed up many queries.
Note that an index on budgetid is automatically added by the creation of the foreign key constraint.

Test plan :
- Check performance with an invoice containing a lot of orders.
- Check suggestions pages are faster or at least not slower.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>