Added example classification image with category names
Added some options to a QStackWidget for switching in/out
Added debug '__main__' to dialog
Updated to import new UI class
Added UI functionality for opening map
Table now populates on load of map
Some work toward sample design init

See next commit - better strategy for handling the buttons for each sample
design
Blank class for future implementation of sample designs

Instead of linking lists together and getattr'ing we can define a class
which handles its own buttons, sampling technique, etc. Sample design
class will have option of adding additional buttons, but not required.
Class will also define if it can allocate samples (or not for simple random).
Class will define sampling method (method takes map input and unique classes)
which returns a series of samples