eol: store and reuse pattern matchers instead of creating in tight loop More "right" and more efficient.

eol: fix variable naming - call it _eolmatch instead of _eolfile It is not the file but a match object based on it.

parsers: move PyInt aliasing out of util.h The PyInt aliasing is only used by parsers.c. Since we don't want to encourage the use of PyInt parsing, move the aliasing to parsers.c.

osutil: use PyLongObject on Python 3 for listdir_slot This code looks performance sensitive. So let's retain PyIntObject on Python 2 and use PyLongObject explicitly on Python 3.

osutil: use PyLongObject in recvfds PyIntObject doesn't exist in Python 3. While PyIntObject is preferred on Python 2 because it is a fixed capacity and faster, the difference between PyIntObject and PyLongObject for scenarios where performance isn't critical or the caller isn't performing type checking shouldn't be relevant. So change recvfds to return a list of longs instead of ints on Python 2.

py3: use encoding.environ instead of os.environ This complains while running hg version on Python 3.5

store: py26 compat, don't use a dict comprehension

dirs: document performance reasons for bypassing Python C API So someone isn't tempted to change it.

dirs: port PyInt code to work on Python 3 PyIntObject no longer exists in Python 3. Instead, there is PyLongObject. Furthermore, PyInt_AS_LONG is a macro referencing a struct member. PyInt_AS_LONG doesn't exist in Python 3 and PyLong_AS_LONG is a #define for PyLong_AsLong, which is a function. So assigning to the return value of PyLong_AS_LONG doesn't work. This patch introduces a macro for obtaining the value of an integer-like type that works on Python 2 and Python 3. On Python 3, we access the struct field of the underlying PyLongObjet directly, without overflow checking. This is essentially the same as what Python 2 was doing except using a PyLong instead of a PyInt.

dirs: convert PyString to PyBytes PyStringObject was renamed to PyBytes in Python 3 along with the corresponding PyString* functions and macros. PyString* doesn't exist in Python 3. But PyBytes* is an alias to PyString in Python 2. So rewrite PyString* to PyBytes* for Python 2/3 dual compatibility.