Crank up the warnings and resolve as many as possible #75
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Tested with gcc and clang on linux. I believe gcc's
-Wclobbered
is genuinely buggy and most or all of the warnings it produces here are false positives, so I'm leaving that one turned off, even though it seems handy for es'setjmp
-heavy code. (See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65041 and attached issues for more on GCC's behavior.) Helps move toward #3.