current positive when flowing into device, e.g.
Ic, Ib of a positively biased npn.
Add current measurement for all nodes of a device,
e.g. .probe i(Q1) will measure Ic, Ib, Ie (and Is)
Code to enable current measurements at all top level
device pins and to enable differential voltage measurements
between two (arbitrary, top level) device nodes.
Adds 0 V voltage sources for current measurements to selected or all
device nodes at top level (including X lines)
Adds an E source excited by two arbitrary nodes for differential
potential (aka voltage) measurements between these nodes
Function inp_probe() is called from inpcom.c
Holger Vogt
Carsten Schoenert