made some modifications and renamed `gen_three_port` to `three_twoports_2_threeport`. i hate both of these names
made some modifications and renamed `gen_three_port` to
`three_twoports_2_threeport`. i hate both of these names

willhaines/scikit-rf,aerialist/scikit-rf,willhaines/scikit-rf,scikit-rf/scikit-rf,gibbons/scikit-rf,Ttl/scikit-rf,Ttl/scikit-rf,willhaines/scikit-rf,gibbons/scikit-rf,Ttl/scikit-rf,temmeand/scikit-rf,willhaines/scikit-rf,temmeand/scikit-rf,hohe/scikit-rf,gibbons/scikit-rf,jhillairet/scikit-rf,aerialist/scikit-rf,hohe/scikit-rf,scikit-rf/scikit-rf,hohe/scikit-rf,hohe/scikit-rf,temmeand/scikit-rf,aerialist/scikit-rf,jhillairet/scikit-rf,jhillairet/scikit-rf,Ttl/scikit-rf