errout.adb (Set_Msg_Insertion_Warning): Correct typo causing tests to fail if insertion sequence is at end of message...

2013-01-02  Robert Dewar  <dewar@adacore.com>

	* errout.adb (Set_Msg_Insertion_Warning): Correct typo causing
	tests to fail if insertion sequence is at end of message string.
	* opt.ads: Minor comment fixes and additions.
	* sem_ch7.adb, sem_ch8.adb, sem_ch9.adb, sem_ch10.adb, sem_ch11.adb,
	sem_ch12.adb, sem_ch13.adb: Add tags to warning messages.
	* sem_ch6.ads, sem_ch6.adb (Cannot_Inline): Deal with warning message
	tags. Add tags to warning messages.

From-SVN: r194785