* cygpath.cc: Include argz.h.

	* cygpath.cc: Include argz.h.
	(options_from_file_flag): Move from main to global static variable.
	(mode_flag): Ditto.
	(do_sysfolders): Rename from dowin and accommodate throughout.
	Don't exit from here.
	(do_pathconv): Rename from doit and accommodate throughout.
	(print_version): Change copyright.
	(do_options): New function, centralizing option processing.
	Rework checking options for correctness.
	(action): New function, centralizing calling worker functions.
	(main): Simplify.  Move option processing to do_options.  Move calling
	worker functions to action.  Rework getting arguments from files.