Added simple advanced mode test for network data

Based on this simple circuit shown in java applet at link below (just
one source and one ground).  Will add more complex problems.

http://www.falstad.com/circuit/#%24+1+4.9999999999999996E-6+10.20027730826997+39+5.0+50%0Ar+240+192+320+304+0+100.0%0Ag+400+192+400+240+0%0Ai+464+128+304+128+0+1.0%0Ar+320+304+400+192+0+100.0%0Ar+240+192+304+128+0+100.0%0Ar+304+128+400+192+0+100.0%0Ag+464+128+464+176+0%0Ax+298+106+311+112+0+24+0%0Ax+204+199+217+205+0+24+1%0Ax+311+343+324+349+0+24+3%0Ax+407+211+420+217+0+24+2%0A
Added mgNetworkVerify1 test to verify.py

Simple advanced mode test described in previous commit of input and
output files