bug #34302: Feature request : device configuration with parent classes

* config_gram.y: if memory section is overwritten old entry is removed
        
(not in original patch)
* config_gram.y: if programmer or part is defined twice, a warning is
  output and the first instance is removed
        
General cleanup and free functions, so valgrind does not report any lost
blocks at program end.
* avrpart.[hc]: added avr_free_(opcode|mem|part) functions
* pgm.[hc]: added pgm_free function
* update.[hc]: added free_update functions
* config.[hc]: added cleanup_config function, use yylex_destroy to reset
  the lexer after usage. (So it can be reused.)
* main.c: add cleanup_main function which is called by atexit() (This 
  frees all lists so that at program exit only really lost memory is 
  reported by valgrind.)
* usbasp.c: added libusb_free_device_list() and libusb_exit() calls to
  avoid lost memory
* buspirate.c: moved memory allocation from initpgm to setup and added 
  free in teardown
* configure.ac: add definition of HAVE_YYLEX_DESTROY if $LEX is flex.
* Makefile.am: added . in front of SUBDIRS to build avrdude before trying
  to use it for creating the part list for the docs.



git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1041 81a1dc3b-b13d-400b-aceb-764788c761c2

usbasp.c

@@ -305,6 +305,7 @@ static int usbOpenDevice(libusb_device_handle **device, int vendor,
             handle = NULL;
         }
     }
+    libusb_free_device_list(dev_list,1);
     if (handle != NULL){
         errorCode = 0;
         *device = handle;
@@ -401,11 +402,7 @@ static int           didUsbInit = 0;
 /* Interface - prog. */
 static int usbasp_open(PROGRAMMER * pgm, char * port)
 {
-#ifdef USE_LIBUSB_1_0
-  libusb_init(&ctx);
-#else
-  usb_init();
-#endif
+  /* usb_init will be done in usbOpenDevice */
   if (usbOpenDevice(&PDATA(pgm)->usbhandle, pgm->usbvid, pgm->usbvendor,
 		  pgm->usbpid, pgm->usbproduct) != 0) {
     /* try alternatives */
@@ -474,6 +471,11 @@ static void usbasp_close(PROGRAMMER * pgm)
     usb_close(PDATA(pgm)->usbhandle);
 #endif
   }
+#ifdef USE_LIBUSB_1_0
+  libusb_exit(ctx);
+#else
+  /* nothing for usb 0.1 ? */
+#endif
 }