Spirit Parser library

The development branch has been declared stable. There are a lot of new features and improvements from the previous stable release (1.2.9).

This version adds --enable-spirit-threadsafe and --with-boost= configure script options, uses the BOOST_STATIC_CONSTANT in Phoenix to increase portability, rearranges the Spirit debug code so it will always work regardless of include order, adds a new group_d directive, adds the capability for subrules to have contexts, fixes compile problems with SPIRIT_THREADSAFE, fixes the symbols add() free function, makes adjustments to the refactoring parser, fixes the ast_xml.cpp example, adds tests for the object_with_id class, and adds phoenix_subrule_calc.cpp and grouping_calc.cpp examples.

This version has been rewritten to be policy
based, allowing great customizability and
flexibility. There are also some new examples and
more tests.

Addition of some missing typename keywords to multi_pass.hpp, addition of some missing inline keywords to exceptions.ipp to fix multiple symbol definition linker errors when using spirit in more than one translation unit, and changing assert(n1 < n2); to assert(n1 <= n2); in loops.ipp's finite_loop::parse().

This release fixes a bug in the tst class which caused a possible false match in the symbol table class.