Use appendStringInfoString/Char et al where appropriate.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: f92d6a540ac443f85f0929b284edff67da14687a
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2015-07-02T09:36:03Z
Releases: 9.6.0
Use appendStringInfoString/Char et al where appropriate.

Patch by David Rowley. Backpatch to 9.5, as some of the calls were new in
9.5, and keeping the code in sync with master makes future backpatching
easier.

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