Merge branch 'master' into styler

* master: (26 commits)
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  Replace old constructor call by __construct() in dokuwiki_xmlrpc_server
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  change two spaces to a space
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  Upgrade to jQuery 1.11.3 and jQueryUI 1.11.4 closes #1175
  update confToHash() inline documentation for new  parameter
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  Plugins can send usage data
  fixed isBundled() check when remote info is unavailable
  avoid accessing nonexistant array key. fixes #1165
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  Define the negation character in a constant
  Ensure single value negation is not affected by white space differences
  Ensure filtering only removes empty string values (not other values which PHP evaluates to false)
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  ...