DeepLabCut 2.0.7 (including 3D support)

Function updates:
-- GUI update to include auto-off zoom/pan and lock view #293
-- GUI up/down hotkeys added for radio buttons #318 #319
-- implemented robuster downloading of the weights (and legacy version intact) #280
-- new cropping functionality for plotting on full frame or cropped frame:deeplabcut.create_labeled_video(path_config_file,[video],displaycropped=True) #301 #309
-- creating labeled video with cropping+save_frames=True #218
-- deeplabcut.filterpredictions includes a median filter (beyond ARIMA)
-- new feature to plot "skeleton" and a history of points on videos during deeplabcut.create_labeled_video
-- many documentation updates! (+ Colab demo Notebook update, general notebook updates)
-- set matplotlib to 3.0.3 and numpy to 1.14.5 in setup.py as latest versions cause errors.
-- splitting log files during training of multiple networks
-- cropping parameters can be directly passed to deeplabcut/pose_estimation_tensorflow/predict_videos.py
-- fixed bug for GPU allocation in deeplabcut/pose_estimation_tensorflow/predict_videos.py
-- optional manual frame grabber scroll bar extension #316

New features:
-- 3D project creation that includes 2 camera support for 3D analysis.

• These functions handle camera calibration, undistortion, checking alignment, and 3D triangulation with a new .h5 or .csv output file. It also includes tools to plot in 3D space alongside each 2D view.
  -- new 3D_Demo_DeepLabCut.ipynb
  -- new 3D documentation
  -- new video tutorial for 3D: https://www.youtube.com/watch?v=Eh6oIGE4dwI