* taf-kit/src/b_commands.cc: Add letter context.
	* taf-kit/src/commands_macros.hh: Add macro to import letter context.
	* taf-kit/src/common.hh: Declare new structures.
	* taf-kit/src/fmp_commands.cc: Add letter context.
	* taf-kit/src/main.cc: Remove useless code.
	* taf-kit/src/parser_options.hh,
	* taf-kit/src/parser_options.hxx: Use new templatized
	  token_representation. Add static code resolution.
	* taf-kit/src/z_commands.cc: Add letter context.