patch #7688: Implement parent programmers feature

* avrdude.conf.in: updated documentation comment and some programmers 
    have now parents
  * config_gram.y: initpgm will now called at first use of programmer 
    in main. parser sets only the function pointer in the pgm structure.
    Pin and pin lists definitions can now be empty to remove the parents
    setting.
  * doc/avrdude.texi: updated documentation
  * main.c: added call to pgm->initpgm after locate_programmer
  * pgm.[hc]: added field initpgm in structure, added function pgm_dup


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1045 81a1dc3b-b13d-400b-aceb-764788c761c2

pgm.c

@@ -82,6 +82,7 @@ PROGRAMMER * pgm_new(void)
   pgm->config_file[0] = 0;
   pgm->lineno = 0;
   pgm->baudrate = 0;
+  pgm->initpgm = NULL;
 
   for (i=0; i<N_PINS; i++)
     pgm->pinno[i] = 0;
@@ -147,6 +148,25 @@ void pgm_free(PROGRAMMER * const p)
   free(p);
 }
 
+PROGRAMMER * pgm_dup(const PROGRAMMER const * src)
+{
+  PROGRAMMER * pgm;
+
+  pgm = (PROGRAMMER *)malloc(sizeof(*pgm));
+  if (pgm == NULL) {
+    fprintf(stderr, "%s: out of memory allocating programmer structure\n",
+            progname);
+    exit(1);
+  }
+
+  memcpy(pgm, src, sizeof(*pgm));
+
+  pgm->id = lcreat(NULL, 0);
+
+  return pgm;
+}
+
+
 static void pgm_default(void)
 {
   fprintf(stderr, "%s: programmer operation not supported\n", progname);