There were some bugs in my blocking code that are fixed in this.
I had the setblocking() flag reversed, and wasn't passing the
flag along to the underlying code properly.
Many changes were based on conventions in the Python socketmodule.
Changed many of the docstrings to match the Python socket library
conventions and enhancing them. I can either remove the prototype
part or add it to other docstrings in the library, depending on
feedback I get.
Changed setblocking to use the flag argument instead of always
just setting NONBLOCK.
Added enable/disable threading around more lwip calls.
Implementing optional backlog on listen().
Removing a few seemingly unneeded Py_INCREF(Py_None) calls.
Moved getblocking function based on alpha sorting of names.
