Improvements to compile-time-option hygiene. Use "#if OPTION" instead of

Improvements to compile-time-option hygiene.  Use "#if OPTION" instead of
"#ifdef OPTION" in cases where that makes sense, so that -DOPTION=0 will work.
Add the "Have-Not" configuration in releasetest.tcl which disables all of
the "HAVE_component" compile-time options.

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