Merge stored procedures

[AlexZhidkov]

Merge RecalculateCostsForAssembly into RecalculateRecurse so calculating costs, demand and capability done with one walk over parts tree with single entry through call to Recalculate stored procedure.
Best approach would be to:

1. write tests for current RecalculateRecurse to make sure it works properly as is
2. merge stored procedures
3. make sure test cases for RecalculateCostsForAssembly and old RecalculateRecurse not broken when using combined stored procedure.

[AlexZhidkov]

Part 1 is done. Tests can be found in Bom.Database.Tests projects.