update file headers to remove copyright years

doc/dev/coding.html

@@ -1,6 +1,5 @@
 <!--
- - Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
- - Copyright (C) 1999-2002  Internet Software Consortium.
+ - Copyright (C) Internet Systems Consortium, Inc. ("ISC")
  -
  - Permission to use, copy, modify, and/or distribute this software for any
  - purpose with or without fee is hereby granted, provided that the above
@@ -294,12 +293,12 @@ If a function returns a value, it should be cast to (void) if you don't
 care what the value is, except for <CODE>printf</CODE> and its variants,
 <CODE>fputc</CODE>, <CODE>fwrite</CODE> (when writing text),
 <CODE>fflush</CODE>,
-<CODE>memcpy</CODE>, <CODE>memmove</CODE>, <CODE>memset</CODE>, 
+<CODE>memcpy</CODE>, <CODE>memmove</CODE>, <CODE>memset</CODE>,
 <CODE>strcpy</CODE>, <CODE>strncpy</CODE>, and <CODE>strcat</CODE>.
 <P>
 
 Certain functions return values or not depending on the operating
-system or even compiler flags; these include 
+system or even compiler flags; these include
 these include <CODE>openlog</CODE> and <CODE>srandom</CODE>.
 The return value of these should not be used nor cast to (void).
 <P>