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/driver/_cdio_stream.h

@@ -18,8 +18,8 @@
 */
 
 
-#ifndef __CDIO_STREAM_H__
-#define __CDIO_STREAM_H__
+#ifndef CDIO_STREAM_H_
+#define CDIO_STREAM_H_
 
 #include <cdio/types.h>
 #include "cdio_private.h"
@@ -126,7 +126,7 @@ extern "C" {
 }
 #endif /* __cplusplus */
 
-#endif /* __CDIO_STREAM_H__ */
+#endif /* CDIO_STREAM_H_ */
 
 
 /*