20230611 cran

[zachcp]

• Update Description file as requested by CRAN
• incorporate #142 from Rick
• rebuild cdkjar
• bump version
• fix a number of small issues fro CRAN compatibility.
• if we get accepted to CRAN, I will tag for release

[zachcp]

@rajarshi this is the PR for the v3.8.0 package that is now on CRAN. If tests pass and the package looks good to you, please squash-merge.