0x00010001
	- add ecb_is_pot32/64.
        - add intptr_t/uintptr_t.
        - add ECB_PTRSIZE.
        - more macros for C/C++ version checks.
        - support C11 atomics for memory fences.
        - support gcc-4.7 atomics for memory fences.

TODO: ecb_restrict_array etc. http://ue.tst.eu/5093eafd713ec5fda776d8065070aa4c.txt
TODO: ffs/clz
64 bit variants of everything
TODO: examples from X for clz/ctz
TODO: arithmetic right shift
TODO: template/generic functions for x32/x64 and so on
TODO: #define ecb_integer_multiples_of(n,d) ((char (*)[d])(n) - (char (*)[d])0)
TODO: generalised shift
TODO: #define ECB_FAST_UNALIGNED_ACCESS
unsigned long gensh(unsigned long v, int x) {
int a, b;
    a = (v << x) & -(((unsigned int)x) < 32);
    x = -x;
    b = (v >> x) & -(((unsigned int)x) < 32);
    return a|b;
}
