Notes about libpc implementation
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1. Boost library usage

	The following are the boost library includes in libpc
	1. shared_ptr.hpp in pcMathVM.h
	2. indirect_iterator.hpp in pcMathVM.h, pcVariable.h
	3. function.hpp in pcConstraint.h
	4. spirit/include/classic.hpp in pcParser.h
	5. graph/graph_traits.hpp in pcNetwork.h
	6. graph/adjacency_list.hpp in pcNetwork.h
	7. graph/graphviz.hpp in pcNetwork.h
	8. spirit/include/classic_symbols.hpp in pcMathVM.h
	9. next_prior.hpp in pcMathVM.cpp
	10. ref.hpp in pcConstraint.h
   The above and corresponding dependencies are added to the src/other/boost directory using
   	bcp --scan --boost=BOOST_DIR pcMathVM.h pcConstraint.h\
		pcParser.h pcNetwork.h pcMathVM.cpp ../other

