Peter Fordham

htc.c and hts.c missing include of <time.h> for definition of time(...)

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Found as part of this effort: https://fedoraproject.org/wiki/Toolchain/PortingToModernC When compiling with strict C99 compliance we see that both htc.c and hts.c use time without the correct header being included hts.c:433: implicit...

### Issue description When you run this example, opaque black regions occasionally appear in the visualization. This appears to be caused by the surface3 function returning values larger than 1.0...