[patch, libgfortran] PR47567 Wrong output for small absolute values with F editing

[Jerry DeLisle]

This small patch adjusts the processor generated width for F0.d formatting to 
accommodate negative signs on zero.

Regression tested on x86-64. Updated test case provided.

OK for trunk?

Regards,

Jerry

2011-02-18  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libgfortran/47567
	* io/write_float.def (output_float): Adjust width for F0.d to
	allow space for negative signs on zero.
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