Concurrency & spinner fix

[themoenen]

Two issues have been addressed:

1. Prevent os.remove(training_file) error from interrupting process when running in concurrent threads
2. Fixed the spinner implementation so it's properly disabled in API mode, regardles of where it's being called
   --> Simplified redundent GLOBAL_SETTINGS["VERBOSE"] with GLOBAL_SETTINGS["display"] != "api"

Note: Toolkit files have been updated to avoid inconsistency but this is all dead code and will be removed

[PhillipDowney]

Note they changed legacy RXN toolkit, try and avoid find replace on naming.