Removed old comments and code

The configuration interface is done, so we shouldn't have any comments
that say otherwise.  Also, since the shell never exits, it's silly to
put the code that runs it in a loop.

src/main.c

 {
     chEvtSignal(pdb_led_thread, PDB_EVT_LED_SLOW_BLINK);
 
-    /* TODO: implement the configuration mode */
+    /* Disconnect from USB */
     usbDisconnectBus(serusbcfg.usbp);
 
+    /* Start the USB serial interface */
     sduObjectInit(&SDU1);
     sduStart(&SDU1, &serusbcfg);
 
+    /* Start USB */
     chThdSleepMilliseconds(100);
     usbStart(serusbcfg.usbp, &usbcfg);
     usbConnectBus(serusbcfg.usbp);
 
-    //char text[] = "Hello, world!\r\n";
-
-    while (true) {
-        //sdWrite(&SDU1, (uint8_t *) text, 15);
-        //obqWriteTimeout(&SDU1.obqueue, (uint8_t *) text, 15, TIME_INFINITE);
-        //chprintf(&SDU1, "Hello, world! %d\r\n", ST2S(chVTGetSystemTime()));
-        pdb_shell();
-        chThdSleepMilliseconds(100);
-    }
+    pdb_shell();
 }
 
 static void pd_buddy(void)

src/shell.c

             }
         }
     }
-    return;
 }