Get rid of flextype

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Originally reported by: Anonymous

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About Flextype

The flextype module was an early approach to make method calls of classes
faster.

From the docstring in flextype.c :

"An extension type that supports cached virtual C methods"

Flextype is used for tasklets, channels and the stacklessmodule as the base type.

This was a very well working trick to make methods very fast, to override them
from C and from Python, with caching.

I think time is ripe to replace flextype by regular heaptypes, because Python has
good enough caching now.

Another use-case was the ability to define the stacklessmodule with module methods,
something that I thought was missing.

Meanwhile it is easy to create an object by using a class as a module surrogate
and expose some methods. In other words: Flextype is no longer necessary and should go away.

At the same time I think it makes sense to abandon stacklessmodule as it is and replace it by a _stackless module that implements the bare minimum necessary.
All the rest should be implemented in a stackless.py module that makes things
nicer and supplies methods etc.

The _stackless module should for instance hold the current tracing functions to make
them fast callable during a transfer. For retrieving those functions, there is no need for C code. Instead, the stackless.py module should provide a class and access functions to support introspection.

My goal:

turn as much C code into Python code as possible, unless speed is a concern

replace special code by builtin code as much as possible

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• Bitbucket: https://bitbucket.org/stackless-dev/stackless/issue/47

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Original comment by Kristján Valur Jónsson (Bitbucket: krisvale, GitHub: kristjanvalur):

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I agree.
I also think that the dynamic module attributes (e.g. stackless.current) should be deprecated, since I don't think any other python code uses this conceps. As they are, they can certainly be emulated using classes :)

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Original comment by RMTEW FULL NAME (Bitbucket: rmtew, GitHub: rmtew):

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Once this is done, visit issue #22 which is on hold pending resolution of this issue.

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Original comment by Kristján Valur Jónsson (Bitbucket: krisvale, GitHub: kristjanvalur):

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Already working on this.

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Original comment by Kristján Valur Jónsson (Bitbucket: krisvale, GitHub: kristjanvalur):

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Merged in krisvale/stackless-scratch/no-flextype (pull request #8)
Closes Issue #47: Getting rid of flextype