worker and connection objects correctly

buffer, and includes all necessary headers

- ActiveMQ client library no longer statically linked
  will now have to deployed again as package libactivemq-cpp6
- Message plugin implementation library packaged as libtrackrdr-activemq
  (distributes libtrackrdr-activemq.so)
- Package trackrdrd depends on libtrackrdr-activemq
- libtrackrdr-activemq depends on libactivemq-cpp6

All other mq.* config parameters retired except for mq.module

* message queue plugin interface implemented in trackrdrd
* ActiveMQ connections now implemented as plugin (builds shared object)
All 'make check' tests pass

successful reconnect fails.

            they are restarted too often ("abandoned" appears in monitoring)