train_arg_ S3 generic added;
guess_train_type added
random_partition replacing random_factor
- check file added
- utilised with train
- tests for train initiated
- global options set to control printing of checks and messages
- trained model a class
- better printing method for trained and grouped models
- documentation added for train
- added utils-assert for easy checks
- added checks
- used randomr for tests
- added tests
- added examples where missing
- broke down each script into manageable sections
- base functions simplified
- trimmed whitespace