Changes in version 0.1.6                        

  - deal with multi-cohort routine for pulling coverage fvps. For
    details, see youtrack:
    https://mrc-ide.myjetbrains.com/youtrack/issue/VIMC-8760/fix-vimpact-for-routines-with-multiple-cohorts

                        Changes in version 0.1.5                        

  - resolve a previous update that matches burden outcome to burden
    outcome code which did not capture the special case of rubella
    outcomes.

                        Changes in version 0.1.4                        

  - Produce age specific calendar impact.

                        Changes in version 0.1.3                        

  - Recognise new burden outcomes.

                        Changes in version 0.1.2                        

  - Add to readme installation instruction.

                        Changes in version 0.1.1                        

  - Able to recognise different no-vaccination scenario types.

                        Changes in version 0.1.0                        

  - Increase flexibility - recognize new activity type, compare impact
    between different scenario types.

                       Changes in version 0.0.10                        

  - Include DTP3 in the disease vaccine delivery table to extract the
    coverage values from the DB

                        Changes in version 0.0.9                        

  - Build get_population and extract_vaccination_history functions to
    pull data for specified demographic_source

                        Changes in version 0.0.8                        

  - Fix impact_meta.R.

                        Changes in version 0.0.7                        

  - Fix both csv and function interfaces, so that they work for 2021
    runs and generate identical results.

                        Changes in version 0.0.6                        

  - Add wrapper function for running impact calculations for many
    scenarios

                        Changes in version 0.0.5                        

  - Replace impact calculation internals with dplyr

                        Changes in version 0.0.4                        

  - Fix extract_vaccine_history() and cohort_deaths_all_cause().
    (VIMC-4444)

                        Changes in version 0.0.3                        

  - Add helper for retrieving year aggregated summary data

                 Changes in version 0.0.2 (2020-07-17)                  

  - further constrain read_csv/read_sql to load system files when
    applicable

  - add tests for impact_meta.R, commonly_used_db_data.R, and
    impact_central.R

                 Changes in version 0.0.1 (2020-06-18)                  

  - impact calculation for central estimates