Fix budget on cost estimate creation with multiple Sources

Divid Logistics requisition line budget by pro-rata of proposed product
of logistics requisition source.

Eg. 1 LRL budgetized at 1000.- is source by 1 LRS with 4 products
and 1 LRS with 6 products
Resulting Cost Estimate will have a line of 4 products with 400.-
budget and a second with 6 products with 600.- budget.
Add one test and adapt existing tests as qantity are needed for computation