Changes in version 1.0.1 (2020-02-07)                  

  - Added '[]' based extraction and replacement within intsp and intgrd
    objects.
  - Changed several class() checks to inheritance() checks to avoid
    errors in conditionals with class objects of length > 1.

                 Changes in version 1.0.0 (2019-07-07)                  

  - Added a NEWS.md file to track changes to the package.