Squashed commit of the following:

commit d94f5463f508773a7b027230cd81b61cf8c9cfce
Author: Mark Andrews <marka@isc.org>
Date:   Tue Oct 30 11:52:32 2012 +1100

    <string.h> -> <isc/string.h>

commit d707d6fb739c6e6df90a864141b418a13d3bccc8
Author: Mark Andrews <marka@isc.org>
Date:   Tue Oct 30 11:48:20 2012 +1100

    address coverity warnings