added RAPID to help text

compiler/LabComm.java

@@ -30,6 +30,8 @@ public class LabComm {
     println("[ Python options ]");
     println(" -P                      Generates Python code in FILE.py");
     println(" --python=PFILE          Generates Python code in PFILE");
+    println("[ RAPID options ]");
+    println(" --rapid=FILE            Generates RAPID code in FILE");
     println("[ Misc options ]");
     println(" --pretty                Pretty prints on standard output");
     println(" --typeinfo=TIFILE       Generates typeinfo in TIFILE");