and this time also fix the cext itself to properly handle int vs. long
on py2k

This reverts commit de0d144a395c31eb74084177df95a4858b830f88.

Apparently the test suite is not using the cextensions correctly at the moment.

method, and its interaction with result-row processing, now allows
the columns passed to the method to be positionally matched with the
result columns in the statement, rather than matching on name alone.
The advantage to this includes that when linking a textual SQL statement
to an ORM or Core table model, no system of labeling or de-duping of
common column names needs to occur, which also means there's no need
to worry about how label names match to ORM columns and so-forth.  In
addition, the :class:`.ResultProxy` has been further enhanced to
map column and string keys to a row with greater precision in some
cases.  fixes #3501
- reorganize the initialization of ResultMetaData for readability
and complexity; use the name "cursor_description", define the
task of "merging" cursor_description with compiled column information
as its own function, and also define "name extraction" as a separate task.
- fully change the name we use in the "ambiguous column" error to be the
actual name that was ambiguous, modify the C ext also

From [PEP 479](https://www.python.org/dev/peps/pep-0479/) the correct way to
terminate a generator is to return (which implicitly raises StopIteration)
rather than raise StopIteration.

Without this change using sqlalchemy in python 3.5 or greater results in
these warnings
    PendingDeprecationWarning: generator '__iter__' raised StopIteration
which this commit should remove.

by the ORM :class:`.Query` object (part of the performance
enhancements of :ticket:`3175`) would not raise the "this result
does not return rows" exception in the case where the driver
(typically MySQL) fails to generate cursor.description correctly;
an AttributeError against NoneType would be raised instead.
fixes #3481

un-adjusted internal symbol names for "anonymous" labels, which
are the "foo_1" types of labels we see generated for SQL functions
without labels and similar.  This was a side effect of the
performance enhancements implemented as part of references #918.
fixes #3483

"max_row_buffer" execution option for BufferedRowResultProxy
- also add documentation, changelog and version notes
- rework the max_row_buffer argument to be interpreted from
the execution options upfront when the BufferedRowResultProxy
is first initialized.

it to prevent excess memory usage with yield_per