overwrite of existing items (i.e. programs with the same internal code).
Add support for [exec:<file>.js] sections: for executing another JavaScript
files as part of the install.
Add support for [eval:string] sections: for evaluating a JavaScript expression
as part of an install.
Add support for an optional "prompt" key for each item. If set to a string,
overrides the default confirmation prompt text. If set to false, disables
the confirmation prompt for that item.