getEvents - id<=0 now resets server's notion of client's id to last N events (and starts sending there)

Some Python/ssl module versions incorrectly initialize hashlib, causing weird openssl errors. Importing hashlib explicitly helps.

More sensible configuration file defaults, some sections left commented to prevent unnecessary default filtering and/or adding Node info

Logging module in Python 2.6 does not accept unicode socket path - but strings from JSON configuration are always unicode. Applied workaround, now on 2.6 Client accepts at least ASCII filenames for syslog socket.

 * Server is now in line with Idea spec concerning client names - they are stored in db and compared lowercase
 * Fixed duplicity check when adding/modifying client
 * Secret is not secret anyway, simplify Client and logging code

* --pid_file is now on command line, instead of in cfg file (better supports startup shell scripts)
* filer now supports done_dir, where processed messages get stored instead of removing them
* sender now can opportunistically wait if the number of event files to process is lower than send_events_limit. Governed by owait_* cfg file options

* Shorter example config

Export correct time with timezone
Export virus scan report in correct format

Minor updates

* fixed missing 'dml' modifier in some queries

Server now limits max accepted event size. events.data changed to longtext to accomodate longer events

Server now silently logs and skips events which cannot be deserialized from db. That can happen if too big event slips in and db truncates it, causing invalid JSON.