Megacommit of dozens of files.

Cleanup of redundant/useless header file inclusion.

ISC style lint, primarily for function declarations and standalone
comments -- ie, those that appear on a line without any code, which
should be written as follows:
   /*
    * This is a comment.
    */

lib/isc/lib.c

@@ -19,10 +19,8 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <stddef.h>
 
 #include <isc/once.h>
-#include <isc/error.h>
 #include <isc/msgcat.h>
 #include <isc/lib.h>