add  real ZVA40 class, which inherits most of its commands from the PNA . mostly works, but needs more testing
add  real ZVA40 class, which inherits most of its commands from the
PNA . mostly works, but needs more testing

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