* Issue #159: Fix windows_utils.socketpair()

  - Use "127.0.0.1" (IPv4) or "::1" (IPv6) host instead of "localhost", because
    "localhost" may be a different IP address
  - Reject also invalid arguments: only AF_INET/AF_INET6 with SOCK_STREAM (and
    proto=0) are supported

* Reject add/remove reader/writer when event loop is closed.
* Fix ResourceWarning warnings

index.  This avoids the possibility of setting an iterator to an invalid
state.

index.  This avoids the possibility of setting an iterator to an invalid
state.

to the exhausted state.

exception is raised.  self is set to None to break a reference cycle.

Thanks Vajrasky Kok and Zachary Ware.

Thanks Vajrasky Kok and Zachary Ware.

Add issue number to tick_counter, PyOS_ReadlineFunctionPointer, marshal
optimizations (add Antoine's contribution to the entry under the marshal
module), and absolute paths in __file__.

 the uninstaller anymore.

noticed by Claudiu Popa.

I also added the docs that never got committed, editing the patch provided by
Claudiu.

I collapsed the now three versionchanged directives for discovery into one.  I
tried several different styles for this.  The most obvious is a bulleted list,
but currently the only way I could find to produce that is to have *something*
appear on the versionchanged line after the colon, which combined with the
blank space before the bulleted list just looks wrong.  I also tried the
current single-line-three-sentences version with bullet characters before each
sentence, and I almost went with that as it made it clear that the three
sentences are independent.  But I decided to just go with the sentences for
simplicity reasons.

Bug filed and initial attempt at a patch by Bohuslav Kabrda.

are opened in text mode. Patch by Serhiy Storchaka.

Code patch by Serhiy Storchaka