time_comparison_flextable: Create a period comparison table and conditionally format as...
In brianwonch/mediamunger: Utilities for Munging Kenshoo, Social, and Display data

Create a period comparison table and conditionally format as a FlexTable

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time_comparison_flextable(week_comparison_df, final_week, previous_week,
  campaign_to_filter, campaign_col = "campaign", group_colname = "week",
  last_year_final_week = NULL, agg_fun)

`week_comparison_df`	performance dataframe filtered to relevant periods for time comparison (e.g. just last-week, previous-week, and last-week-last-year)
`final_week`	string identifying the most recent period
`previous_week`	string identifying the previous period
`campaign_to_filter`	string or regexp indicating campaign to filter on
`campaign_col`	string identifying the "campaign" column for filtering
`group_colname`	period colname, typically "week"
`last_year_final_week`	optional string identifying a third period (e.g. for year-over-year reporting)
`agg_fun`	summarise function