Field trails extension for logging.
Merge branch 'pladypos_bts2013' of https://github.com/labust/labust-ros-pkg into pladypos_bts2013
Correction to the USBLManager to avoid multiple usbl requests on reinit. USBL filter tf frame request changed to current.
Merge branch 'pladypos_bts2013' of https://github.com/labust/labust-ros-pkg into pladypos_bts2013
Merge branch 'pladypos_bts2013' into usbl_comms