[w3m-dev 02967] parallel image downloading

* fm.h (ImageCache): add touch, pid
* image.c (getCharSize): retry fscanf
* image.c (drawImage): retry fflush
* image.c (MAX_LOAD_IMAGE): added, default 4
* image.c (image_cache): change to ImageCache**
* image.c (image_lock): added
* image.c (load_image_handler): signal SIGUSR1
* image.c (load_image_next): signal SIGUSR1
* image.c (loadImage): parallel image downloading
* image.c (getImage): initialize touch, pid
* image.c (getImageSize): return value is TRUE or FALSE
		retry fscanf
From: Hironori Sakamoto <hsaka@mth.biglobe.ne.jp>

fm.h

@@ -1,4 +1,4 @@
-/* $Id: fm.h,v 1.47 2002/02/03 06:12:41 ukai Exp $ */
+/* $Id: fm.h,v 1.48 2002/02/03 06:38:49 ukai Exp $ */
 /* 
  * w3m: WWW wo Miru utility
  * 
@@ -325,6 +325,8 @@ typedef struct _imageCache {
     char *url;
     ParsedURL *current;
     char *file;
+    char *touch;
+    pid_t pid;
     char loaded;
     int index;
     short width;