Py-interface

* py_interface/erl_term.py: Bugfixes for handling of negative
integers. Reported by bird devdoer <devdoergmail.com>.

* py_interface/erl_eventhandler.py: handles interrupted system
call exceptions also in the timeout case.
* py_interface/erl_node.py: doc string fix for methods
ErlMBox.Send and ErlNode.SendMsgFromMBox: the order of the process
name and node name had gotten mixed up. Noted by Paul TBBle
Hampson.
* py_interface/erl_node_conn.py: Python 2.6 compatibility patch by
David Reiss <dreissfacebook.com> applied: uses md5 from hashlib
if that one is available.

Applied two patches from Anton Krasovsky:
* The first fixes a crash when the connection from python to
erlang node is terminated, because the erlang node has gone down
or stopped replying to pings
* The second fixes a crash when a connection between python node
and the erlang node has been broken due to lack of ping
responses from the erlang node (erlang process was suspended),
and then when erlang process is resumed and terminated,
exception was thrown.

Fixed a few cases of the version number not getting properly
inserted into all files, and one bug related to buildning: now all
files needed to build gets properly included in the distribution
tar file.

Applied patch from David King:
* The socket connections now also checks for EWOULDBLOCK, not only
EAGAIN.

Applied patches from David King:
* The code now resides in its own namespace: py_interface
* Now supports packaging as an easy_install egg
* Bugfix: Queued writes attempted to access an undefined variable.

* Updated to work with Erlang R10 and R11 (15-->28 bits in pids
and ports).
* Now also works with threaded Tcl (as with Debian) as well.
* Also fixed a deprecation issue: integer vs floating-point
timeout values in erl_event_handler.py.
* Also added an installation support (the __init__.py file), based
on information by Ed Blake.