forked from boostorg/conversion
* reduces templates count * leaves only one lexical converting class (at least for modern compilers) * fixes small TODOs and XXXs from source code * makes lexical_stream_limited_src more readable * updates status/explicit-failures-markup.xml * makes lexical_cast_inf_nan_test.cpp pass on Itanium pltform * makes lexical_cast able to convert signed and unsigned chars to wchar_t and updates lexical_cast_wchars_test [SVN r73313]