Add proposal of math framework for complex grad

No gxx

More things work when g++ is not available.

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Added Tutorial on Python's memory management

This tag tell that an optimization will insert Op with c code only.
We don't want to run that optimization then there is no c compiler.

-move to outer function call to mp.seterr
-Don't always create the same constant
-inline a function call in the inner for loop.

fix destroy_map bug in scan

add infer_shape method to Solve Op

remove the inplace flags. It is the opt that should add them, but opt in this file only move the computation to the gpu. They don't make them inplace.