2014-01-22  Yannick Moy  <moy@adacore.com>

	* errout.adb (Initialize): Remove trick to add dummy entry
	in Warnings table.
	* erroutc.adb (Set_Warnings_Mode_Off,
	Set_Warnings_Mode_On): Do nothing if warnings are suppressed by
	command line switch.
	* opt.ads (Warning_Mode): Document behavior
	wrt pragma Warnings, in normal mode and in GNATprove_Mode.

From-SVN: r206927