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

config.c

@@ -55,6 +55,13 @@ extern char * yytext;
 
 #define DEBUG 0
 
+void cleanup_config(void)
+{
+  ldestroy_cb(part_list,avr_free_part);
+  ldestroy_cb(programmers,pgm_free);
+  ldestroy_cb(string_list,free_token);
+  ldestroy_cb(number_list,free_token);
+}
 
 int init_config(void)
 {
@@ -62,7 +69,7 @@ int init_config(void)
   number_list  = lcreat(NULL, 0);
   current_prog = NULL;
   current_part = NULL;
-  current_mem  = 0;
+  current_mem  = NULL;
   part_list    = lcreat(NULL, 0);
   programmers  = lcreat(NULL, 0);
 
@@ -301,6 +308,11 @@ int read_config(const char * file)
 
   yyparse();
 
+#ifdef HAVE_YYLEX_DESTROY
+  /* reset lexer and free any allocated memory */
+  yylex_destroy();
+#endif
+
   fclose(f);
 
   return 0;