added an experimental implementation of "optimized built-in answers".
this version records pre-rendered authors/version.bind answers and reuses them to build responses very efficiently. This implementation intends to show how we can customize the RRset class by inheritance from the base abstract class to optimize response generation. git-svn-id: svn://bind10.isc.org/svn/bind10/branches/parkinglot@562 e5f2f494-b856-4b98-b285-d166d9295462
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