Changes in version 0.7
   - added vignette
   - minor bug fixes
   
Changes in version 0.6-3
   - test for cancellation error in sump
   - minor warnings fixes
   - updated documentation
   - this version never uploaded to CRAN
   
Changes in version 0.6-2
   - importFrom added for CRAN
   - Description enhanced

Changes in version 0.6-1
   - new maintainer email address
   - added CITATION file
   - this version never uploaded to CRAN

Changes in version 0.6
   - added weights to sumz
   - updated documentation

Changes in version 0.5-1

   - updated DESCRIPTION
   - First upload to CRAN

Changes in version 0.5

   - first substantial version

