Discard all XSPICE event data when using "-b -r", as there is no way

to access it.  An initial step for FR #105: "Esave + rawfile".

src/include/ngspice/evtproto.h

@@ -162,4 +162,5 @@ int Evt_Parse_Node(const char *node, struct node_parse *result);
 
 void Evt_purge_free_outputs(void);
 
+void EVTdiscard(void);
 #endif

src/main.c

@@ -1563,6 +1563,11 @@ int main(int argc, char **argv)
                are ignored, except .save, which has been handled by ft_dotsaves()
                from within inp_spsource (), data are put into linked list dbs.
             */
+#ifdef XSPICE
+            // Do not save any XSPICE node data, as there is no way to use it.
+
+            EVTdiscard();
+#endif
             int error2 = ft_dorun(ft_rawfile);
             /* Execute the .whatever lines found in the deck, after we are done running. */
             if (ft_cktcoms(TRUE) || error2) {

src/xspice/evt/evtprint.c

@@ -963,6 +963,8 @@ static void set_all(CKTcircuit *ckt, Mif_Boolean_t val)
         node_table[i]->save = val;
 }
 
+void EVTdiscard(void) {set_all(g_mif_info.ckt, MIF_FALSE);}
+
 void
 EVTsave(wordlist *wl)
 {