Make chart images save in correct folder.

[toonarmycaptain]

Images save in correct folder in app data/image_data
Stretch - user to select/create folder (eg in my documents) for charts, then have subfolders for each class and save images or copies thereof there.
Or - have user pick save as folder for each image, possibly defaulting save dialogue GUI to above selected folder.

[toonarmycaptain]

GitMate.io thinks possibly related issues are #67 (Make avatar images save in correct folder. ), #17 (Logic for image generation), #33 (Take avatar images and process them), and #77 (Remove top and right border from generated image.).