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Merge remote-tracking branch 'origin/QA_4_2' into QA_4_2
Bug 4449: Mediawiki export does not produce table header row; also fix related PHP warnings

Signed-off-by: Isaac Bennetch <bennetch@gmail.com>
Merge pull request #1216 from ibennetch/4449

Bug 4449: Mediawiki export does not produce table header row; also fix related PHP warnings
Merge commit '82e682899f10ec52da899059f20a921584497e17'
Merge remote-tracking branch 'origin/QA_4_2'