Release of MRPT 1.5.2

Changelog:

• Changes in libraries:
  • mrpt_base
    • Added methods:
      • mrpt::synch::CCriticalSection::try_enter()
      • mrpt::synch::CCriticalSectionRecursive::try_enter()
  • mrpt_nav
    • mrpt::nav::CAbstractNavigator: callbacks in mrpt::nav::CRobot2NavInterface are now invoked after navigationStep() to avoid problems if user code invokes the navigator API to change its state.
    • Added methods to load/save mrpt::nav::TWaypointSequence to configuration files.
  • mrpt_slam
    • rbpf-slam: Add support for simplemap continuation.
• BUG FIXES:
  • Fix reactive navigator inconsistent state if navigation API is called from within rnav callbacks.
  • Fix incorrect evaluation of "ASSERT" formulas in mrpt::nav::CMultiObjectiveMotionOptimizerBase