Add more includes so header files are self-contained

Peter Eisentraut <peter_e@gmx.net>

Commit: b48008676002895c284c9a7a3d4fc7210b58044d
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-01-21T20:49:53Z
Releases: 10.0
Add more includes so header files are self-contained

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