[patch, fortran] make fortran dumps more readable

[Thomas Koenig]

Hello world,

this patch makes the Fortran dumps easier to read.  Most of the work was
done by Paul, with some changes by me.  Any errors and omissions are
mine, of course.

OK for trunk if regression-testing turns up nothing (which is really to
be expected)?

	Thomas

2010-10-31  Thomas Koenig  <tkoenig@gcc.gnu.org>
	    Paul Thomas  <pault@gcc.gnu.org>

	* dump-parse-tree.c (code_indent):  Take label into acount
	when calculating indent.
	(show_typespec):  Also display class.
	(show_attr):  Add module name to argument.
	Don't show UNKNOWN for flavor, access and save. Don't show
	SAVE_NONE.  Don't show INTENT_UNKNOWN.  Show module for use
	association.  Show intent only for dummy arguments.
	Set length of shown symbol names to minimum of 12.
	Show attributes header.
	(show_symbol):  Adjust show_level.
	(show_symtree):  Clear up display for ambiguous.  Show if symbol
	was imported from namespace.
	(show_code_node):  Clear up indenting.  Traverse symtree and
	show code directly instead of calling show_namespace.

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