[Ada] Allow ! and !! insertions anywhere in compiler message

[Arnaud Charlet <charlet at adacore dot com>]

This patch relaxes the restriction that ! and !! must appear at the end
of a compiler message. They can now appear anywhere. This is only an
internal implementation change with no functional effect, so no test.

Tested on x86_64-pc-linux-gnu, committed on trunk

2013-07-08  Robert Dewar  <dewar@adacore.com>

	* errout.adb (Set_Msg_Txt): No longer sets Is_Style_Msg,
	Is_Warning_Msg, or Is_Unconditional_Msg (all are set elsewhere
	now).
	* errout.ads: Insertions ! and !! no longer have to be at the
	end of the message, they can be anywhere in the message.
	* erroutc.adb (Test_Style_Warning_Serious_Unconditional_Msg):
	Replaces Test_Style_Warning_Serious_Msg
	* erroutc.ads (Has_Double_Exclam): New flag New comments for
	existing flags (Test_Style_Warning_Serious_Unconditional_Msg):
	Replaces Test_Style_Warning_Serious_Msg
	* errutil.adb (Test_Style_Warning_Serious_Unconditional_Msg):
	Replaces Test_Style_Warning_Serious_Msg

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