* Fix self / other typecode compatibility check and add test

    * In CPython, PyErr_BadArgument() C-API function always raises an
      exception and returns zero

    * It is needed to add the `except -2` clause, so that the exception
      raised by PyErr_BadArgument() is not ignored

    * Additionaly, the `return -1` statement in array.extend() will have
      no effect, and hence is misleading, so it needs to be removed
Signed-off-by: Yury V. Zaytsev <yury@shurup.com>

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extra : transplant_source : e%BE%0A8%0D%B6%A4A%B4%9F%98bZ%ED%C5%CD%D9%AD%E0%7C

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extra : transplant_source : %93%13%FC%AA%07x%7D%14%F7E%D8%C0%01%DC%40%1C%BF%0F%F6S

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rename : docs/src/userguide/tutorial.rst => docs/src/tutorial/cython_tutorial.rst
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extra : transplant_source : Zp%DC%BB8%03%B2%D6%A3%09q%13%25%17%AD6%17%25%1FU

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extra : transplant_source : E%BEhL%948%C1%07%EC%BDx%7C%7E%C2%3Fq%1D%EFE%BC

There was a word missing.

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extra : transplant_source : %B2%3E%E6%8CF%00%89%0E%AF%3A%C2%40%1E%D9%A7%E7S%E67A

remove another reference to the old distutils build (in quickstart!) and clarify the description of the Sage notebook a bit