* Separate script engine from main function, minor reorganization

src/main/ocarina-scripts.ads

+package Ocarina.Scripts is
+
+   procedure Ocarina_Shell;
+   --  Launch Ocarina interactive mode
+
+   Standard_Input        : Boolean := True;
+
+end Ocarina.Scripts;

src/main/ocarina-utils.adb

+with Output; use Output;
+with Ocarina.Configuration; use Ocarina.Configuration;
+
+package body Ocarina.Utils is
+
+   -------------
+   -- Version --
+   -------------
+
+   procedure Version is
+   begin
+      Write_Line
+        ("Ocarina " & Ocarina_Version
+           & " (" & Ocarina_SVN_Revision & ")");
+
+      if Ocarina_Last_Configure_Date /= "" then
+         Write_Line ("Build date: " & Ocarina_Last_Configure_Date);
+      end if;
+
+      Write_Line
+        ("Copyright (c) 2003-2009 Telecom ParisTech, 2010-"
+           & Ocarina_Last_Configure_Year & " ESA & ISAE");
+   end Version;
+
+end Ocarina.Utils;

src/main/ocarina-utils.ads

+package Ocarina.Utils is
+
+   procedure Version;
+   --  Display version information
+
+end Ocarina.Utils;