* cygpath.cc (usage): Change usage output slightly.

	* cygpath.cc (usage): Change usage output slightly.

	* cygpath.cc (main): Add option l to support conversion to
	Windows long file names.  Refactured code for capital options.
	Support of options from file for capital options.
	(dowin): New function.  Refactured from main.
	(doit): Call long path conversion.
	(get_long_name): New function.
	(get_long_paths): New function.
	(get_long_path_name_w32impl): New function.  Reimplementation
	of Windows API function GetLongPathName (only 98/Me/2000/XP or
	higher).
	(get_short_name): Call GetShortPathName only once.
	(get_short_paths): Fix calculating buffer size.
	* utils.sgml: Update cygpath section for l option.