remove geventreactor.

First step of Twisted removal. This breaks quite a lot.
remove FileDescriptor
Kill off all imports of "twisted".

For now, this kills the SSH module (no longer supported),
the fs20tr code (unused in production, not particularly stable),
and the ability to test things.
Tests start to work.

Surprisingly little breaks.

* added __future__ stuff.
get dabroker from the archive, not from the superdir

and depend on it when installed, dammit
Split binaries to their own package.

not yet tested
simplify shutdown
Mass checkin to fix expected debugging prefixes
strip fs20 test

fs20_tr does not exist any more (for now)
mod_data test: don't check for running event

that's an internal item, testing for which makes no sense
test for the wait-er instead
parser: add end-of-input dot

This is a no-op but prevents not-interpreting the last line of input

This is a workaround, but …
fix message level handling
fs20: allow spurious trailing bytes
syslog test: nc shall only listen to IPv4

otherwise there's a race condition
fix timer handling

Let the sleep function (while testing) actually do the right thing

this is a much simpler (and more-obviously-correct) version than
the old Twisted-style code
enhance gevent thread error handling
don't let wait's repr lock
onewire test: drop spurious logging
tests: monkeypatch!