* common.hh: Adjust to new command-line options
	* getters.hxx: Adjust automaton loader to new formats
	* main.cc: Adjust to new command-line options
	* pipe.hh: 
	* pipe.hxx, Add i/o format information to
	result container.
	* pipe_getters.hh,
	* pipe_getters.hxx: Add new i/o format getters
	* pipe_writers.hh,
	* pipe_writers.hxx: Add new i/o format writer.

	Automaton i/o format can be specified in taf-kit using
	-i, --input-type=INPUT_TYPE and -o, --output_type=OUTPUT_TYPE.
	In command sequences, this is specific to each command.

	Supported types:
	Input:
	  vcsn-b: FSM, XML.
	  vcsn-z: FSM, XML.
	  vcsn-tdc: XML.
	Output:
	  vcsn-b: FSM, XML, DOT.
	  vcsn-z: FSM, XML, DOT.
	  vcsn-tdc: XML, DOT.