adding console logging (streamhandler) so outout sent to loggers is also sent to the screen (useful for Airflow to pick up and display in its logs)

There is no preprocessing required now.

...to reflect recent changes in ews-source-calc commit e162c48.

This reverts commit 1f935d5f.

- Individual grouping based on GroupBy content (defined in config)
- Allow grouping by multiple columns
- Handling NaN while creating individual groups
- Handling '+' separrated group names

(Adding missing columns)

... to reflect latest changes in ews-advisory-builder.

...to reflect latest changes in underlying package ews-advisory-builder.