[w3m-dev 03431] save file by background process

* file.c (loadGeneralFile): use _doFileCopy()
	(_doFileCopy): renamed from doFileCopy()
			lock
			fork & save
	(doFileSave): lock
			fork & save
* fm.h (DownloadList): added
	(FirstDL): added
	(LastDL): added
* form.c (struct internal_action): add download
* funcname.tab (DOWNLOAD_LIST): added
* html.h (URLFile): add url
* main.c (dump_extra): add add_download_list
	(main): add_download_list, ldDL()
	(_quitfm): added
	(quitfm): rewrite with _quitfm()
	(qquitfm): ditto
	(w3m_exit): stopDownload()
	(addDownloadList): added
	(checkDownloadList): added
	(convert_size3): added
	(DownloadListBuffer): added
	(download_action): added
	(stopDownload): added
	(ldDL): added
* proto.h (ldDL): added
	(convert_size): added
	(convert_size2): added
	(doFileCopy): deleted
	(_doFileCopy): added
	(addDownloadList): added
	(stopDownload): added
	(checkDownloadList): added
	(download_action): added
* url.c (openURL): save url in uf
From: Hironori SAKAMOTO <hsaka@mth.biglobe.ne.jp>

html.h

@@ -1,4 +1,4 @@
-/* $Id: html.h,v 1.9 2002/10/10 16:59:33 ukai Exp $ */
+/* $Id: html.h,v 1.10 2002/11/15 15:19:45 ukai Exp $ */
 #ifndef _HTML_H
 #define _HTML_H
 #ifdef USE_SSL
@@ -72,6 +72,7 @@ typedef struct {
 #ifdef USE_SSL
     char *ssl_certificate;
 #endif
+    char *url;
 } URLFile;
 
 #define CMP_NOCOMPRESS   0