Docker Image V2.0 Release

[DavidPL1]

With a little delay we now released version 2.0 of the docker image.

Beside several improvements of the simulation software, the main changes relevant to the challenge are the following:

Added

• Camera parameters are now available. Each camera has its designated camera_info topic and TF frames that allow to convert between pixel and world coordinates of rgb and depth images as requested in Availability of camera parameters (intrinsic and extrinsic) #4.

• The service calls /reload_with_old_scene and /reload_with_new_scene were added as requested in Spawning objects at different random positions without re-launching container #6.
  Example usage was added to the example.
  Note: reloading requires to manually restart ROS controllers (example).

• More documentation on the life cycle of a task run has been added in the wiki.

Fixed

• Fixed discrepancies in difficulty level parameters between screwing and plugging task as reported in GPU availability and difficulty level #5.
  Both now start at difficulty level 1.
• Invalid difficulty levels now produce an error message and cause the simulation loading to fail.