Will change in 0.12

This silents GCC warnings (in 64 bits) about casting integer to pointer of different size.

cast result of "sizeof()" to "int" in testcase, silents GCC warnings about signed/unsigned comparisons

--HG--
extra : transplant_source : %9E%5C%97%85%EC%7C%E7%EB%0AZ%8E%1A%B1%C0%1F%14%AA%5B%25R

--HG--
extra : transplant_source : -%B8%D3%E8%BB%2C%A3B1%D1%8B%C3%06M%16%82%F1%91%B7G

--HG--
extra : transplant_source : %03%EF%05%8Dq3%FB%88%89G%2B%BC%7B%A5%A57%3A%C6%0Bs

--HG--
extra : transplant_source : %96m%88%15%985T%8E%FF%CEW%16%5B%E3%1E%90%8E%23%00%AE

--HG--
extra : transplant_source : H%22Z%EF%DA%20m4l%C6%8A%EB%94%DD%9B%DA%20%0Bn%C6

--HG--
extra : transplant_source : %0C%16_W%14l%E8%11%CC%EBc%97%B3%23%B2%87%7D%C0uY

--HG--
extra : transplant_source : %E1%9D%DB%8B%E0%1D%C3%AEMD%7Cn%AA%D95%16%D9%085%9C

--HG--
rename : Demos/Setup.py => Demos/setup.py

Split int/float division cases for efficiency, make it work even if C compiler takes floor (don't know of any that do).