corrected invalid_function_underscore to call on invalid_signal_underscore to solicit for a double underscore
corrected invalid_function_underscore to call on invalid_signal_underscore to solicit for a double underscore

myhdl/myhdl,jandecaluwe/myhdl,hgomersall/myhdl,jandecaluwe/myhdl,hgomersall/myhdl,josyb/myhdl,jck/myhdl,myhdl/myhdl,jandecaluwe/myhdl,jck/myhdl,josyb/myhdl,josyb/myhdl,myhdl/myhdl,jck/myhdl,hgomersall/myhdl