Move imported packages to Suggests #201
Description
It would be good to reduce the number of imported packages, per
checking package dependencies ... INFO (1.7s) Imports includes ## non-default packages. Importing from so many packages makes the package vulnerable to any of them becoming unavailable. Move as many as possible to Suggests and use conditionally.
Please review the codebase and identify packages that are not essential to package operation. Where such packages are used, include a prompt that allows the user to easily install the packages "on demand". Be sure to comply with CRAN policies throughout. These packages can then be moved to Suggests: in the DESCRIPTION file, and imports removed from the namespace. Associated tests should be updated accordingly, to be skipped if the package is not available, but to still run if it is.