new file:   generateResistorGridNetlist.m
new file:   tests/ps2a.mat
modified:   NodalAnalysis.m
modified:   forwardSubst.m
modified:   generateResistorGridNetlist.m
modified:   tests/ps2a.mat
new file:   GNUmakefile
try to speed things up.  Disable trace in withPivotLU.m, and add debug mode for verifyUpperTriangular().

modified:   NodalAnalysis.m
modified:   backSubst.m
new file:   changeDebug.m
new file:   disableDebug.m
new file:   enableDebug.m
modified:   forwardSubst.m
modified:   generateResistorGridNetlist.m
new file:   isDebugEnabled.m
modified:   noPivotLU.m
modified:   tests/ps2a.mat
modified:   withPivotLU.m
modified:   tests/ps2a.mat
modified:   tests/withPivotLU.m
modified:   withPivotLU.m
new file:   ../ps1.2.netlist.plotted
new file:   fit.m
renamed:    ps2a.mat -> ps2a.m