Modernize the unittest support classes

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Originally reported by: Anselm Kruis (Bitbucket: akruis, GitHub: akruis)

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The Stackless unittests have a long history and it is required to run them twice: with and without soft switching. This makes it inconvenient to run all or some tests from an IDE.

During my work on https://bitbucket.org/stackless-dev/stackless-testsuite I created support classes, that play nice with IDEs. Now I used these classes as a starting point to modernize Stackless/unittests/support.py. With the new implementation, it is no longer required to run the test suite twice. Instead for each test method testSomething() a second method testSomething_H() is created, that runs with soft switching disabled.

I'll create a pull request, because this change requires a review.

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• Bitbucket: https://bitbucket.org/stackless-dev/stackless/issue/86

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Original comment by Anselm Kruis (Bitbucket: akruis, GitHub: akruis):

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It is pull request #16 for 2.7-slp

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Original comment by Anselm Kruis (Bitbucket: akruis, GitHub: akruis):

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I just merged pull request #16 into 2.7-slp.

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Original comment by Anselm Kruis (Bitbucket: akruis, GitHub: akruis):

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Implemented:

• 3.3-slp: d523e990aafa
• 3.4-slp: eeb94260771f
• default-slp: 0c82fa22fcc8