[Dune] [#670] Remove obscure "DUNE developer mode"

[Dune]

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The following task is now closed:

FS#670 - Remove obscure "DUNE developer mode"
User who did this - Christian Engwer (christi)

Reason for closing: Fixed
Additional comments about closing: in dune-common r6334

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=670

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