[Ada] Interpretation of Form parameter for Ada.Directories.Copy_File

[Arnaud Charlet <charlet at adacore dot com>]

The Form parameter of procedure Copy_File is now interpreted. Two fields
are recognized: preserv=<value> (no_attributes, all_attributes or
timestamps) and mode=<value> (copy, overwrite or append).

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

2010-10-04  Vincent Celier  <celier@adacore.com>

	* a-direct.adb (Copy_File): Interpret the Form parameter and call
	System.OS_Lib.Copy_File to do the work accordingly. Raise Use_Error if
	the Form parameter contains an incorrect value for field preserve= or
	mode=.
	* a-direct.ads (Create_Directory, Create_Path): Indicate that the Form
	parameter is ignored.
	(Copy_File): Indicate the interpretation of the Form parameter.

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