LOTS of stuff:

+ Add new JSON-based config file
+ Save the config and log in a different place on Windows than other
platforms
* Simplify a few things
* Add check for the user's previous answer to the reload prompt

TODO Test with --open
Fill in levelchecks docstrings, add missing __all__  values
Completely bypass reload prompt if open parameter is used
Fix Exception being thrown if user did not select a destination path
Fix #13: Do not permit saving a file without opening one first