Documents unpack, adds more constants, adds data related properties (message)
Implements message queue facility, adds linear range limits, implements positioning
Splits identify.py into identify.py and home.py
Adds documentation to identify.py and home.py
Fixes a runtime error in controller.py
Fixes issues wrt to data length not being retained and datastring in message.py
Fixes a command line argument parse error in home.py
Renames set_position to goto, which allows separation of rel. and abs. move (controller.py)
Fixes a typo in home.py
Adds goto.py which moves the stage to an absolute position
Merge branch 'master' of github.com:freespace/pyAPT