[Ada] Add support for stop bits and parity in serial port configuration.

[Arnaud Charlet <charlet at adacore dot com>]

Testing on i686-linux, committed on trunk

Add support for stop bits and parity in serial port configuration.
The timeout has been relaxed and can now be given as a duration
instead of a plain integer. At the same time the MingW implementation
is using the new s-win32.ads unit instead of declaring Win32 services.

2008-04-08  Pascal Obry  <obry@adacore.com>

	* g-sercom.ads, g-sercom.adb (Data_Rate): Add B115200.
	(Stop_Bits_Number): New type.
	(Parity_Check): Likewise.
	(Set): Add parameter to set the number of stop bits and
	the parity. Parameter timeout is now a duration instead
	of a plain integer.

	* g-sercom-linux.adb:
	Implement the stop bits and parity support for GNU/Linux.
	Fix handling of timeout, it must be given in tenth of seconds.
	
	* g-sercom-mingw.adb:
	Implement the stop bits and parity support for Windows.
	Use new s-win32.ads unit instead of declaring Win32 services
	directly into this body.
	Update handling of timeout as now a duration.

	* s-win32.ads, s-winext.ads: New files.

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