Changes in version 1.0.3

   * Adaptation to StratigrapheR 1.1.1, R 4.0

Changes in version 1.0.2

   * Update to dplyr 1.0.0 to make use of the generalisation of dplyr::lag()
   and dplyr::lead() to matrices


Changes in version 1.0.1

   * Update to StratigrapheR 1.0.1 to get improved divisor() function
   * respace: fixed bug
   * gzc.departure: change in the definition of GZC departure, thereby changing
   the function output
