SISI is disabled by default, and crashes if enabled

Bugzilla Link	954
Created on	May 15, 2012 14:22
Version	svn
OS	Linux
Architecture	PC

Extended Description

I just discovered that SISI is NOT enabled by default, and
that it crashes (in SISI) if you enable it:
sac2c -V
sac2c v1.00-beta (Haggis And Apple)
 developer rev 17818:MODIFIED linux-gnu_x86_64
 (Tue May 15 09:02:34 EDT 2012 by sac)
I was going to extend it to simplify LACFUN arguments
by removing duplicate shapes, but that pit has just grown a
bit deeper... Poop.