ENH: Added tests to the extra options read in

A simple test (distutils/testing/test_system_info.py)
to check that the options are read in correctly has been added.
This test has a few faults:

A) It does not allow strict library checks as that can be
   _very_ system dependent.
B) It compiles some simple C-programs but does currently not link
   them to a shared library.
C) As such the test does not check that the flags are actually used.

To circumvent this one should:

A) Make a library of the compiled sources.
B) Check that a runtime_library_dirs is working by checking
   with ldd
C) Make a preprocessor flag to check the output of two commands which
   should differ according to the flags in each block

I am not too much into the distutils compiler suite. So I have not
endeavoured on this path.

- The current test shows that the flags are read in by the standard system_info
  object and can thus be considered a "stable" solution.

- Added note of the 1.10 release schedule.

- Corrected the site.cfg.example, added runtime_library_dirs to
  the OpenBLAS example where it seems appropriate.

- Bugfix for the site.cfg.example (the [DEFAULT] block should be
  name [ALL])
  This might have lead to some confusion, but many of the libraries
  are linked explicitly by their own sections, hence it might not have
  been caught.

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