tests harder

just one way

fixed bug; cost was considered a disconnected input

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