2008-05-20  Robert Dewar  <dewar@adacore.com>

	* opt.ads (Treat_Restrictions_As_Warnings): New switch

	* sem_prag.adb, par-prag.adb, restrict.ads: Implement flag
	Treat_Restrictions_As_Warnings.

	* switch-c.adb: Recognize new switch -gnatr

	* usage.adb: Add line for -gnatr

From-SVN: r135632