Substitution formula in the data reader protocol definition

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It could be useful for developers to have substitution formulas recognized on the path of a data reader. This could help particularly in two situations:

1) If we copy a database on the same machine and rename it, there is no need of changing manually all data readers paths

2) When we want to load all files within the same folder identified by a substitution formula: at the moment, to use that, we need to deactivate the All option from the Data Reader action of the procedure, and specify the custom file for a single file per action. With the substitution formula directly on the data reader path, the All option would be usable for dynamic paths as well