rename CVar -> CGenus

pub/lib/CMakeLists.txt

pub/lib/commands.cpp

pub/lib/edif.cpp

pub/lib/fassign.cpp

pub/lib/file_in.hpp

pub/lib/func.hpp

pub/lib/geni.cpp

pub/lib/genus.cpp

pub/lib/genus.hpp

pub/lib/manip.cpp

pub/lib/node.cpp

pub/lib/olf.cpp

pub/lib/olf.hpp

pub/lib/opr.cpp

pub/lib/reg.cpp

pub/lib/reg.hpp

pub/lib/rssm.cpp

pub/lib/slice.cpp

pub/utest/test001_VCateg.cpp