allow plantuml with doxygen < 1.8.11
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		@@ -14,7 +14,7 @@
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    https://dev.marc.waeckerlin.org/redmine/projects/safechat
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    Implementation Details: @ref security, @ref api, @ref protocol,
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    @ref database
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    @ref database, @ref design
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    SafeChat is a chat program designed to protect your privacy. It is
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    designed to be:
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