1. some platforms do not have inttypes.h, and chasing them down
becomes ridiculous. Therefore, uint64_t can't be used for 64-bit
values.
2. some (other) platforms do not support "long long".
Solution: make AEP_U64 a struct with two longs unless long already is
64 bit long.
Also, restore all other types back to use unsigned char, unsigned int
and unsigned long. Make sure that AEP_U32 actually becomes 32 bits,
even on platforms where long is 64 bits (actually, we're just guessing
that int will stay at 32 bits on those...).
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