Fix closes issue # 15033 - Return the proper exitcode for failure when modules are invoked using -m switch. Patch contributed by Jeff Knupp

There was a window between the write and the chmod where the user’s
password would be exposed, depending on default permissions.  Philip
Jenvey’s patch fixes it.

These files are created by some NFS clients a file is edited and removed
concurrently (see added link in doc for more info).  If such a file is
removed between distutils calls listdir and copy, it will get confused.
Other special files are ignored in sdist (namely VCS directories), but
this has to be filtered out earlier.

Patch by Arfrever.

the Ctrl-C signal handler on Windows

Patch by Serhiy Storchaka.

invalid parameters.

If messages were only added, a new file is no longer created and
renamed over the old file when flush() is called on an mbox, MMDF or
Babyl mailbox.

(helps getting results in real-time when stdio is transmitted over a pipe or socket)

They no longer lose data when an underlying read system call is interrupted.
IOError is no longer raised due to a read system call returning EINTR from
within these methods.

mktime() when timezone offest is supplied.

Loosely based on the work by Hirokazu Yamamoto.