making 'second' numbering scheme the default for concat_ports, as the one being used by ** cascade operator
making 'second' numbering scheme the default for concat_ports, as the one being used by ** cascade operator

jhillairet/scikit-rf,jhillairet/scikit-rf,scikit-rf/scikit-rf,jhillairet/scikit-rf,Ttl/scikit-rf,Ttl/scikit-rf,Ttl/scikit-rf,Ttl/scikit-rf,temmeand/scikit-rf,temmeand/scikit-rf,scikit-rf/scikit-rf,temmeand/scikit-rf