added renamed version of sebc (partition_simple), with 5x speedup by using indexed property maps
added renamed version of sebc (partition_simple), with 5x speedup by using indexed property maps

personalrobotics/lemur,personalrobotics/lemur,personalrobotics/multiset-planning,personalrobotics/multiset-planning,personalrobotics/lemur,personalrobotics/multiset-planning