Use tic.drat to build KWB Cran Repo

[mrustl]

https://github.com/ropenscilabs/tic.drat

[mrustl]

drat can be used to distribute pre-built packages via Github or another server. craneur (not on CRAN) provides another way of creating the same. miniCRAN can be used to create a subset of CRAN, for example for self-hosting of packages and their dependencies.

https://github.com/ropensci/PackageDevelopment/blob/master/README.md