Query Object Framework

Modules
	Book: The QOF Data Set.
	Object: Describing data structure.
	Class: Getting and setting entity values.
	Time: 64bit UTC Time handling.
	Numeric: Rational Number Handling with Rounding Error Control
	KVP: Key-Value Pairs
	Backends: Permanent storage for QOF entities.
	Query: Querying for Objects
	Error: Extensible error handling.
	Trace: Debugging support
	Event: QOF event handlers.
	Choice: One to many links.
	Merge: Merging QofBook structures
	Reference: Referring to entities outside a partial book.
	Undo: Track and undo or redo entity changes
	Utilities: Miscellany

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