incidence2 1.2.0

New functions

• new_incidence(): A minimal incidence constructor.
• validate_incidence(): Check for internal consistency of incidence-like object.
• build_incidence(): Allows you to construct an incidence object whilst specifying
  your own date grouping function.
• format.incidence()

Deprecated functions

• cumulate() will now give a deprecation error. We have removed the function
  to avoid users erroneously regressing against a cumulative count.

Bug fixes

• Fixes bug in incidence() when dates were a character vector and the the
  default, daily, interval was specified.

Other updates

• Now uses dplyr to handle list based columns (e.g. record-type objects from
  vctrs). For data.frames with only atomic columns, data.table is still used.
• Printing and summaries of incidence objects have been improved to remove
  duplication in the overview section.