Added alias for executing scripts (cf. StdIOShell)

git-svn-id: https://svn-dept.inf.ethz.ch/svn/lecturers/a2/trunk@8692 8c9fc860-2736-0410-a75d-ab315db34111

source/Shell.Alias

@@ -5,6 +5,7 @@ create=Tar.Create
 decode=Decoder.Open
 diff=DiffLib.Compare
 extract=Tar.Extract
+execute=System.DoFile
 free=System.Free
 freeall=System.FreeDownTo
 find=SearchTools.Find