v0.49-beta

Changes:

• Ping-pong mode is now enabled for time lapse shots (not just continuous video mode) and for key frame programs
• Added improved run status query -- General command 0.140. This returns a byte where the bits indicate whether a program is in progress, if it is paused, if it is a legacy 2-point or key frame move, if the program is in the pre-start delay phase, if the program is in keep-alive phase, and if the program is in the ping-pong phase. See command list for details.
• Added "Avoid offset" query -- Camera command 4.113. During testing we've noticed that if the controller receives a command during a window of about 900ms after a motor movement in SMS key frame mode, it can cause the controller communications to fail. This query returns the sum of the trigger, focus, and delay times, or the offset from the beginning of an interval at which the motors begin moving. If your application knows when an interval is starting, use this value to find where the window in which you shouldn't be sending commands to the controller begins during each cycle. See command list for details.