- made parameter 'log' able to take value from a 'log_arg' variable in the parent environment (dynamic scoping) of a function
- the old way of assigning value to 'log' is still supported
- new function:
- wh_dict: Create Data Dictionary from Data Warehouse
- moved some codes to internal functions and internal variables
- revised documentation
- bug fixing
- new functions:
- partition_random: partitioning a dataset randomly
- encode_onehot: One Hot encoding
- inspect_smap: a simplified thus faster version of inspect_map
- rewrote codes that produce log files as internal functions
- added vignettes
- revised documentation
- bug fixing