Uninstalls every package that is not part of the R base or
recommended distribution. Packages installed in Microsoft R Open (MRO)
library paths are also preserved. Only packages with no Priority
field (i.e. neither "base" nor "recommended") are removed.
Warning: this operation is irreversible. All third-party packages
will need to be reinstalled afterwards.
Value
Invisibly returns a named list holding the result of
remove.packages() for each removed package (one element per
package). Called primarily for its side
effect of uninstalling packages.