ValueError when called for a closed file.

For a file f, iter(f) now returns f (unless f is closed), and f.next()
is similar to f.readline() when EOF is not reached; however, f.next()
uses a readahead buffer that messes up the file position, so mixing
f.next() and f.readline() (or other methods) doesn't work right.
Calling f.seek() drops the readahead buffer, but other operations
don't.

The real purpose of this change is to reduce the confusion between
objects and their iterators.  By making a file its own iterator, it's
made clearer that using the iterator modifies the file object's state
(in particular the current position).

A nice side effect is that this speeds up "for line in f:" by not
having to use the xreadlines module.  The f.xreadlines() method is
still supported for backwards compatibility, though it is the same as
iter(f) now.

(I made some cosmetic changes to Oren's code, and added a test for
"file closed" to file_iternext() and file_iter().)

if we are running in an OSX framework enabled build directory, test that
the framework infrastructure exists. This catches the very common
error of doing "make install" in stead of "make frameworkinstall".

at compile time: use PBGetCatInfoSync() to get FInfo data in stead of
GetFInfo. The latter doesn't work for folders. The former does, at
least on OSX, and insofar the info makes sense for a folder.

Document heapq module
Add PEP263 section (not sure I really understand the PEP's effect on 8-bit
   strings, though -- will have to experiment with it)

check whether it contains a .nib, and do the Cocoa song and dance if
it does.

exists. Partial fix for #585923.

Handle the two modules with non-standard scanner module names.

xxxPyCObject_Import() seems to be a copy of PyCObject_Import().

setup.py (indirectly) script to build the standard dynamically loaded
modules, the errno module is being made static so it will always be
available.
Closes SF bug #591205 (needed on trunk only).

1) Do not attempt to exec a file which does not exist
just to find out what error the operating system
returns. This is an exploitable race on all platforms
that support symbolic links.

2) Immediately re-raise the exception if we get an
error other than errno.ENOENT or errno.ENOTDIR. This
may need to be adapted for other platforms.

(As a security issue, this should be considered for 2.1
and 2.2 as well as 2.3.)

to search on the command line in that case.

possibly being missing.

where it was: it is really a configuration file, not a normal module.

By moving it into Mac/Lib we can now also store the location of bgen
itself in there, which is needed because bgen isn't installed.

Renamed Py_Main to PyMac_Main as it has a different signature than the "normal" Py_Main, and that signature has appeared in a .h file.

will trigger splitting on any whitespace.

M PyShell.py
M rpc.py
M run.py

having it there causes the line to wrap.

on Windows.  The test_sequence() ERROR is easily repaired if we're
willing to add an os.unlink() line to mhlib's updateline().  The
test_listfolders FAIL I gave up on -- I don't remember enough about Unix
link esoterica to recall why a link count of 2 is something a well-
written program should be keenly interested in <wink>.