[rfc][icedtea-web] filelog for plugin

[Jiri Vanek]

Generally this patch is enabling the possibility lo log to file from plugin (if enabled) + clean up + synchronisation with java (moreover all the same still arround)
- side effects:
    - user can see/set KEY_USER_LOG_DIR in itw settings. This was already implemented in netx, just needed to be enabled (DebuggingPanel.java, Messages.properties)
    - the name of the log made readable (and synchronised across java x c)(FileLog.java)
    - PluginMessageHandlerWorker.java commented out the "woken" message. It had no sense
    - c part -  except main parts of this patch, also various missing end of lines or %s in outputs (which were to much visible in file log!)
        (IcedTeaNPPlugin.cc,)defined filename and  stream, made aware of console logging (to be synced with java part)
            two notes - stream is flushed but not closed after shutdown (it can write even after, and I have not find place to where to close it)
                      -  from each browser run 1-aLotOf plugin file logs are created (mostly twe) reason is, that  some calls are like "lunhcig new executable" - namely GetMIMEDescription and one more
       IcedTeaParseProperties.cc - added functions to read  deployment.user.logdirdeployment.user.logdir (or  return default)  and "deployment.console.startup.mode
   - IcedTeaPluginUtils.cc - new util methods to generate logfile name, to init the lofgile and to print logging status
   - IcedTeaPluginUtils.h - the headers are generated only once during debug/error processing, and reused both for file log and streams log (and also error/debug)

The patch is much more simple then it looks like :o)

As guessable, part of huge rework I posted recently. For any brave soul and larger overview the complete patch is attached again (so th efile logging is doubled)

J.
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