Assorted bug fixes

- If SctProcessNode ran into a timeout, its action data wa sdeleted. If data came
  later, this caused SICS to crash. This is now fixed
- sget leaked connections under certain circumstances
- Cosmetic fix to hipadaba.c
- yet another chnage to the TRICS file format in fourmess.c, now it prints magnetic field
  instead of the proton count

hipadaba.c

@@ -1194,7 +1194,7 @@ int GetHdbProperty(pHdb node, char *key, char *value, int len)
 /*---------------------------------------------------------------------------*/
 char *GetHdbProp(pHdb node, char *key)
 {
-  if (node != NULL && node->properties != NULL) {
+  if (node != NULL && isHdbNodeValid(node) &&  node->properties != NULL) {
     return StringDictGetShort(node->properties, key);
   } else {
     return NULL;