Singular/Sources — pull request #453 by ederc (2013-12-18 16:05:05+00:00)
Title: Brings back p_ExpVectorAddSub(): Used in sba

1. Brings back p_ExpVectorAddSub() resp. pExpVectorAddSub()
2. Uses it as optimization in sba

NOTE: It is more efficient than using p_ExpVectorAdd() and then p_ExpVectorSub() in sba.