[ADD] mrp_product_addition
[IMP] Minor change
[FIX] Changes from comments.
[IMP] Add quantity control
[FIX] Extension change from md -> rst
[ADD] <mrp_production_addition_wko>: Module to merge mrp_production_add_middle_raw_material and mrp_operations_extension
[FIX] Name change mrp_production_addition_operation
[IMP] Module names change
Merge pull request #391 from Daniel-CA/mrp_product_addition

[ADD] mrp_production_add_middle_raw_material