Feature Release

• #405 Fix extracting records that contain redefines of the top level GROUPs.
• #406 Use 'collapse_root' retention policy by default. This is the breaking,
  change, to restore the original behavior add .option("schema_retention_policy", "keep_original").
• #407 The layout positions summary generated by the parser now contains level
  numbers for root level GROUPs. This is a breaking change if you have unit tests that depend on the formatting of the layout
  positions output.

Minor feature release

• #397 Fix skipping of empty lines when reading ASCII files with is_record_sequence = true
• #394 Added an ability to specify multiple paths to read data from (Use .option("paths", inputPaths.mkString(","))). This is a workaround implementation since adding support for multiple paths in load() would require a big rewrite for spark-cobol from data source to data format.
• #372 Added an option to better handle null values in DISPLAY formatted data: .option("improved_null_detection", "false")