- various bug fixes and improvements

- modified automatic instrument detection on six and tecs client

tecs/six.c

@@ -674,9 +674,20 @@ int main (int argc, char *argv[]) {
                   , host, sizeof host, &port);
   ent = gethostbyname(host);
   if (!ent) {
-    PutC("unknown host: ");
-    PutC(host);
-    PutC("\n");
+    if (hostArg == NULL || hostArg[0] <= ' ') {
+      snprintf(host, sizeof host, "%s", getenv("HOST"));
+      hostArg = host;
+    }
+    PutC(service);
+    PutC(" on ");
+    PutC(hostArg);
+    PutC(" not found in InstrumentHostList\n");
+    p=getenv("InstrumentHostList");
+    if (p) {
+      PutC("(");
+      PutC(p);
+      PutC(")\n");
+    }
     return 0;
   }
   snprintf(host, sizeof host, "%s", ent->h_name);