binderr.adb, [...]: New circuitry for handling Maximum_Messages.

2009-04-09  Robert Dewar  <dewar@adacore.com>

	* binderr.adb, errout.adb, errutil.adb: New circuitry for handling
	Maximum_Messages.
	
	* erroutc.adb, erroutc.ads (Warnings_Suppressed): Now tests global
	warning status as well.
	
	* opt.ads (Maximum_Messages): New name for Maximum_Errors.
	
	* switch-b.adb, switch-c.adb: Change name Maximum_Errors to
	Maximum_Messages.
	
	* bindusg.adb, usage.adb: Update line for -gnatm switch

	* gnat_ugn.texi: Update documentation for -gnatmnn compiler switch and
	-mnn binder switch.

	* sem_ch10.adb: Minor reformatting.

From-SVN: r145822