Stackless support, new 16-bit PIC port. py core: - builtin round() accepts second arg - add more special methods: __pos__, __neg__, __invert__ - support for stackless Python calls in VM, strict and non-strict - support for object representation that suits 16-bit archs - implement closures in native code emitter - implement str.splitlines() method lib: - fatfs library upgraded to R0.11 (fixes bugs with unlink) pic16bit port: - new port to 16-bit PIC (reference MCU is dsPIC33J256GP506) - heap is 4600 bytes - implement basic pyb module with delay - implement basic LED and Switch classes docs: - initial docs for micropython module - additional example for Timer callback usage - document instantiating struct objects in uctypes