A code like
|cdef double[:] foo():
|    raise AttributeError('dummy')

generated C code like this:
|  __pyx_L1_error:;
|  (...)
|  __pyx_r.memview = NULL;
|  __Pyx_AddTraceback("view_return_errors.foo", __pyx_clineno, __pyx_lineno, __pyx_filename);
|  __pyx_L0:;
|  if (unlikely(!__pyx_r.memview)) {
|    PyErr_SetString(PyExc_TypeError,"Memoryview return value is not initialized");
|  }
|  __Pyx_RefNannyFinishContext();
|  return __pyx_r;
|}

Which is incorrect in error case, because we set __pyx_r.memview to NULL and
then we test it, so that the PyErr_SetString() is always called in the error
case, which swallows previously-set error. (it also swallowed the traceback,
which I don't understand)

A fix is to jump to return_from_error_cleanup label in case return type is
memoryview, as it is currently done for the case when buffers are present.

A testcase that fauils w/out this fix applied is included, too.

v2: fix test under Python 3 by not using StandardError

--HG--
extra : transplant_source : G%B5%99Og%D1%81%25k%8F%1F%7B%02V%3E%B9%A4y%FF%EA

--HG--
extra : transplant_source : %7B%A4%F1%C4/%E4l%2C_%BFF%5B%B7%9C%9F%E0_%2B%15%3D

move exception class into shadow function as we may not want to export it under the cython.* namespace at this point

removed broken minivect related code from branch since minivect will not be released as part of 0.18

If '' is in sys.path and a module is found the package_path
is relative and breaks the build process.

--HG--
extra : transplant_source : 9%EA%CC%A6%3D%1B9R%EF%0DmM%CFZ%18%F3%EC%06%3B%B7

Use OS-dependent directory separator - a / on windows is interpreted by LINK as a command line switch

--HG--
extra : transplant_source : %A8%F23%AF%26%BC%82y1%86S%1Ac%D3%40%089o%DCQ

--HG--
extra : transplant_source : %E6%CA%F8%11%E8%81u%B9%95%3D%27%C1%0F%F3O%8A%12%3Cnl

--HG--
extra : transplant_source : U%15%0B%8E%81%02%F2kE%AA%07u%EF%82%3D14%F1C%86

--HG--
extra : transplant_source : H%91%CF%08t%B1%908%AE%26%81%1B%F9%2C%9A%3Fh%ECWK

BF: replace show-ref with rev-parse --verify for determining current treeish location

--HG--
extra : rebase_source : 5e91ffb0a20724dc92084bb68288cb6000814dca