0.2:
	Changed to use Data::Flow, strips extern from function declarations.
	Can reliably restrict attention to some included file. 
	Cpp no longer ignored.
0.3:
	Will not bark if an argument to a function is an array.
	Minor misprint corrected. 
	Minimal documentation added.
0.4:
	Made new() use two arg version of bless to allow subclassing
	Made C::Scan a subclass of Data::Flow.
	Added new attributes defines_full, defines_args_full, and
           defines_no_args_full which use cpp -dM to get fully
           resolved #defines.
	Added $C::Scan::MACROS_ONLY which defaults to '-dM'
	Fixed up test.pl a bit to output to a file, and to give more
	   standard testing output.
	Fixed regexp bug that didn't allow macros with any space
	   between the end of the argument list and the beginning of
	   the body section, e.g. #define FOO_NAME(bar)((BAZ*) fooBAR(bar))->baz
	   which is a legal macro.
	Fixed regexp bug which did TOO minimal a match on some
	  argument lists.