v.0.4.1

New features

New function - overlap_method_names(). Overlap methods for a
corresponding overlap method codes.

Changes

• "chain" overlap method split into "x_chain_y" and "y_chain_x".
  "chain" will continue to be supported as a keyword for
  "x_chain_y" OR "y_chain_x" method
• "across" overlap method split into "x_across_y" and
  "y_across_x". "across" will continue to be supported as a
  keyword for "x_across_y" OR "y_across_x" methods
• "inbetween" overlap method split into "x_inbetween_y" and
  "y_inbetween_x". "inbetween" will continue to be supported as a
  keyword for "x_inbetween_y" OR "y_inbetween_x" methods
• Optimised overlaps().
• Changed overlap method codes. Please review any previously specified
  codes with overlap_method_names().

Bug fixes

• make_batch_pairs() (internal) created invalid record pairs.
  Resolved.