Readline support implemented

Hi,

I've been looking for a decent free replacement for spice3f5, in
particular one which supported POLY constructs (so that I can use
NatSemi models). I also really wanted something with a graphical
editor and decent EPS graph output. gnucap, while severely lacking in
the graphics department has loads of potential (especially when
considering that the latest update is under 3 years old ;-), as
opposed to similar packages). I started playing with it, and realised
that adding readline support would be quite straight-forward. So here
is a patch file for gnucap 0.31 which will add basic readline.

I'm considering further work on gnucap, especially with regard to a
gnuplot interface. SpiceCAD
(http://home.t-online.de/home/martin.maschmann/homepage.htm) could
also serve as a good start for a graphical editor.

Anyway, thats my two-cents worth, I can't make any promises about
further contributions.

Regards
Simon Hoffe

3rd year Elec Eng student
Wits University
South Africa
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