F.-request 85: save currents in subcircuits

Separate handling .ic/.nodeset and .save .
Add i(Vxx) to  address translation.
Vxx#branch is not supported.

src/frontend/subckt.c

@@ -1176,7 +1176,31 @@ translate(struct card *deck, char *formal, char *actual, char *scname, const cha
         switch (dev_type) {
 
         case '.':
-            if (ciprefix(".ic", s) || ciprefix(".nodeset", s) || ciprefix(".save", s)) {
+            if (ciprefix(".save", s)) {
+                while ((paren_ptr = strchr(s, '(')) != NULL) {
+                    bool curr = FALSE;
+                    if (ciprefix(" i(", paren_ptr - 2))
+                        curr = TRUE;
+
+                    name = paren_ptr + 1;
+
+                    if ((paren_ptr = strchr(name, ')')) == NULL) {
+                        fprintf(cp_err, "Error: missing closing ')' for .save statement %s\n", c->line);
+                        goto quit;
+                    }
+
+                    bxx_put_substring(&buffer, s, name);
+                    if (curr)
+                        translate_inst_name(&buffer, scname, name, paren_ptr);
+                    else
+                        translate_node_name(&buffer, scname, name, paren_ptr);
+
+                    s = paren_ptr;
+                }
+                bxx_put_cstring(&buffer, s); /* rest of line */
+                break;
+            }
+            else if (ciprefix(".ic", s) || ciprefix(".nodeset", s)) {
                 while ((paren_ptr = strchr(s, '(')) != NULL) {
                     name = paren_ptr + 1;