This is a bit of a hack, but as Cython doesn't yet understand
const overloads with different (usually const) return types,
it can't provide the right type of reference in this case.

Fixed some memory leaks in Utility/Embed.c

Fixed __Pyx_sst_abs with C++11

Found by clang's static analyzer.
None of those are significant, but we might as well fix them.

Some compilers appear to require you to explicitly `#include <cstdlib>` before
providing `std::abs`.

deep-copy finally clauses of try-finally statements earlier to properly support arbitrary statements in them (genexprs, lambdas, etc.)

write XML results before printing test results to make it more likely that we get a test result dump also on later crashes or hangs