Query Object Framework

Modules
	Date: Date and Time Printing, Parsing and Manipulation
	Entity: Types, Identity and Instance Framework
	KVP: Key-Value Pairs
	Math128: 128-bit Integer Math Library
	Numeric: Rational Number Handling w/ Rounding Error Control
	Object: Dynamic Object Class Framework
	Query: Querying for Objects
	Event: QOF event handlers.
	Choice and collect : One to many links.
	Merging QofBook structures
	Referring to entities outside a partial book.
	Misc Utilities
	Logging
	Logging and tracing facility.