Fix a bunch of compilation warnings from clang++. #43
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Mostly these are inconsistent usage of int vs. unsigned int vs. long vs.
size_t, plus one abstract base class that needed a virtual destructor
and a few logical expressions for which clang considers parentheses to
be necessary for clarity.
Also fix a couple of issues found by clang-tidy, mostly related to
narrowing integer conversions. Avoided touching things that might
affect the API or floating point results.