More small header changes:

* Remove leading underscores in header preprocessor names
* Regularize names to include directory parts in the file name
* Untabify files
* Update copyright and remove unmaintained cvs $Id$ line

The justification for removing leading underscores comes from a CERTS Secure Coding recommendation: https://www.securecoding.cert.org/confluence/display/cplusplus/DCL32-CPP.+Do+not+declare+or+define+a+reserved+identifier

See also Savannah bug #35745 https://savannah.gnu.org/bugs/?35745

lib/iso9660/iso9660_private.h

@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2003, 2004, 2005, 2008, 2011
+  Copyright (C) 2003, 2004, 2005, 2008, 2011, 2012
   Rocky Bernstein <rocky@gnu.org>
   Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
 
@@ -22,8 +22,8 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#ifndef __CDIO_ISO9660_PRIVATE_H__
-#define __CDIO_ISO9660_PRIVATE_H__
+#ifndef CDIO_ISO9660_ISO9660_PRIVATE_H_
+#define CDIO_ISO9660_ISO9660_PRIVATE_H_
 
 #if defined(HAVE_CONFIG_H) && !defined(__CDIO_CONFIG_H__)
 # include "config.h"
@@ -71,7 +71,7 @@ typedef struct iso_path_table_s {
 
 PRAGMA_END_PACKED
 
-#endif /* __CDIO_ISO9660_PRIVATE_H__ */
+#endif /* CDIO_ISO0660_ISO9660_PRIVATE_H_ */
 
 
 /*