One of side effects of 15b369028f was that
the default values were only included in Python doc strings if we could
be sure that they could be interpreted as valid Python expressions, but
this change was actually undesirable as it may be useful to see C++
expression for the default value in the doc string even when it isn't
valid in Python.
Undo this part of the change and extend autodoc unit test to check that
this stays fixed.
Closes#1271.
Reinstates autodoc for callback function testcase from #467, actually
tests the resulting docstring in the _runme.py and fixes SWIG/Python
so the expected result is obtained.
It doesn't seem to belong there at all, there is a dedicated callback unit
test for it and it was added to the initial version of autodoc.i back in
124253d698 without any explanation, so just
remove it.
As this callback was used in a PHP test, perform this test for callback.i now
and use "%(uppercase)s" construct inside %callback to test that this works.
