gEDA-dev: Diode symbols in GSchem and PCB

[DJ Delorie]

> Having had a not-so-brief inspection of the .sch file specification,
> this would most certainly require a non-backwards-compatible and
> major change to the file format.

The problem being, what, we need to reference a pre-existing pin by
name?  Without using the existing "make a pin" command?

Can we re-use the 'P' verb, having it take either an int or a string
as the first parameter?

Thus:

P "A15"
{
  T ...
  pinnumber=5
}

We could define this as "find the pin with the matching pinname",
being a shortcut for providing the same x/y/etc info.  It would be
nice if we could reference the T info indirectly too, but less
important.

Else...

v version
A arc
B box
C component
F font
G picture
L line
N net
P pin
T text
U bus
V circle

We could use "R" for a referenced pin, or lower case 'p'.