treat unknown (builtin) names as potential globals instead of requiring them to be builtins at runtime

DOC: Updates EPD references to refer to Canopy

--HG--
extra : transplant_source : %8C%82%A9h%82%8F%FF%C73%DC%93F%A6WV%9F%5BM%FAX

--HG--
extra : transplant_source : %9E%C5%82%92%AAb%CB-v%FF%3C6%C4c%21%2A%CB%B8%D5%AD

--HG--
extra : transplant_source : %09s%F6xN%DA%40%C4%2Cs%19%8C%C0%CD%25rc%ADv%D7

--HG--
extra : transplant_source : Dm%10%1E%DC%25%CFl%B4%E9%95%9A%1E%86%3A%FE%A4%60%BF%C3

fix ASCII compatibility check in __Pyx_init_sys_getdefaultencoding_params(): strncmp() stops at first NUL byte which is the first byte in this case (i.e. no comparison is done at all)

fix ASCII compatibility check in __Pyx_init_sys_getdefaultencoding_params(): strncmp() stops at first NUL byte which is the first byte in this case (i.e. no comparison is done at all)

--HG--
extra : transplant_source : A%2B%5BO%82%05%F7%DEm/%8Ao%08%121%96%8Ao%AB%8C

--HG--
extra : transplant_source : %CD%DB%8CT%85r%FF%0B%1C%60%B3%CD%F8%16%D8%E3%EC%C7%0BL

IPython magics

--HG--
extra : transplant_source : %CA%BB%21%89%8CQ%A0F%3EN%E5%7Cs%01%5D%060A%C8%AF

make encoding setup code safer by not expecting sys.getdefaultencoding() to safely return a bytes object

--HG--
extra : transplant_source : cZx%3E%03l%AC%EDK%E3%C2%F2%2C%9BV%E5%EC%5D%B7%C8

make encoding setup code safer by not expecting sys.getdefaultencoding() to safely return a bytes object

--HG--
extra : transplant_source : M%D5%2C%C2%15%9E%3C%BC%3C%89%25n%95%DF%5C%B8%B5%C5%B8%D9

--HG--
extra : transplant_source : %F3%9A%B7r%F7%DB%C7%88%2B%D2%A4%9C%5E%0FT%B8_XS%D2

avoid C compiler warnings for different integer types and signedness when bounds-checking index in obj.pop() optimisation