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Add beforeinstall/beforeuninstall options to when attribute of copyfile
Currently the "when" attribute of the "copyfile" element accepts the value "beforeall" as the only one to be executed before installations and uninstallations. With that value, the copy is performed twice: first before the
installation and then again before uninstallation.
In many situations is needed to copy a file just once. Add support for values like "beforeinstall" and "beforeuninstall".