• New table_id argument in compare() allows custom table identifiers.
  By default, outputs identify tables as "a" and "b". You can now provide
  meaningful names e.g. compare(..., table_id = c("original", "updated")), which
  are reflected in the output of compare() and related functions. @elipousson

• In the output of compare() with no table_id specified, the table summary
  compare()$tables uses "a" and "b" as identifiers for the table column rather
  than "table_a" and "table_b" as used in prior versions. This is for consistency
  with the case when custom ids are provided using the new table_id argument,
  so that compare()$tables$table always matches the table_id argument.

• weave_diffs_wide() gains a suffix argument so column names in the wide
  output can use custom suffixes instead of _{table_id}. The default keeps the
  behaviour of prior versions. @elipousson

patch to avoid error when inputs are data tables