Fixed incorrect events dimension

See merge request !22

Created lower bound for posterior events chunk size

See merge request !21

Add missing 21 day incidence and prevalence summary.

See merge request !20

Added mean summary longformat

See merge request !19

Make data summaries weekly

See merge request !18

CHANGES:

1. Introduced default unit traffic flow;
2. Removed old test data from data directory.  This now contains real static data only.
3. Brought README.md up to date.
4. Removed extraneous files from root project directory.

Ruffus pipeline

See merge request !16

Deleted example_config.yaml, medium_term.yaml, medium_term_prediction.py, poetry.lock, simulate.py, within_between_config.yaml, tier_info.py files