sharedspice.c: small updates
fix sense2, which is unsupported code
sense2, whitespace cleanup

checked for object file invariance
sense2, cleanup, avoid (SENstruct *) casts
xpsice, fix premature tfree() invocation

reported by "Heini X" on the ngspice-users mailing list

this bug was introduced in

: commit 0af75f3bd968f8a29f88221a81da6f9dafd2fceb
: Date:   Sat Aug 18 18:31:23 2012 +0200
:
:     subckt.c, mif_inp2.c: plug XSPICE setup memory leaks
sharedspice.c: remove bug causing sigsegv
Corrected a prototype related warning
sharedspice.c: improved comments
sharedspice.c, *.h: interface update, more comments
sharedspice.c, .h, .vcproj: comments, update für MS Visual Sudio build
INSTALL add --with-ngshared