win32: backout 1a9ebc83a74c

This change conflicted with TortoiseHg's use of QFileSystemWatcher. Files which
were being monitored (for file-system events) were unable to be reliably updated
using util.atomictempfile.  Often the update would error out in the middle of
the process leaving neither the old or the new file in place.

My guess is that _kernel32.CreateFileA() is triggering an exception that is
not handled correctly within unlink()
color: don't fail on error messages when no curses (issue4237)

The error only occured when Python didn't have curses - such as on Windows and
when Python was built without curses support.

No curses can also be emulated by (re)moving .../lib/python2.7/curses/ from the
Python installation.

It is left as an exercise to figure out exactly what changed in Mercurial that
triggered this error.
setup.py, make: avoid problems with outdated, existing hgext/__index__.py*

"make clean" already removed __index__.py[cdo], but not the __index__.py
(automatically generated by "python setup.py build_hgextindex").

"setup.py build_hgextindex" did not generate a new index if file
__index__.py[cdo] already existed, because if __index__.py was removed,
the compiled file containing the old information was imported and used.
Generate an empty file (with a new timestamp to generate a new .py[cdo])
instead and make mercurial.extensions ignore the unset docs attribute.

One of the problems was a failed test-help.t, to reproduce:

$ rm hgext/__index__.py*
$ echo 'docs = {"mq": "dummy"}' > hgext/__index__.py
$ make test-help.t

With this a "make clean" or "python setup.py build_hgextindex" helps.