[Dune] [#1108] fix clang warnings / issuses

[Dune]

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The following task has a new comment added:

FS#1108 - fix clang warnings / issuses
User who did this - Christoph Grüninger (gruenich)

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After the 2.2 release I'll take care about the warnings from Clang. Many of them might help to improve the code quality. Please refrain from flooding this task with additional patches. I'll try to fix what I judge fix-worthy and afterwards you can demand further changes.
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http://www.dune-project.org/flyspray/index.php?do=details&task_id=1108#comment3575

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