Remove All CVS Id Strings Possible Using a Script

Script does what is expected and tries to do it as
smartly as possible.

+ remove occurrences of two blank comment lines
  next to each other after Id string line removed.
+ remove entire comment blocks which only exited to
  contain CVS Ids
+ If the processing left a blank line at the top of
  a file, it was removed.

doc/posix_users/timer.t

@@ -1,9 +1,6 @@
 @c
 @c  This is the chapter from the RTEMS POSIX 1003.1b API User's Guide that
 @c  documents the services provided by the timer @c  manager.
-@c
-@c  $Id$
-@c
 
 @chapter Timer Manager