This code is adapted from
but uses an
Rcpp alternative to
readLines for speed.
It will be anywhere from 2x to 10x faster than the
This is also many times faster than
especially if only a subset of "all" packages in
libPath are desired
(1000x ? for the 1 package case).
Character vector of packages to determine which version is
installed in the
The library path where all packages should be installed, and looked for to load
installedVersions("reproducible", .libPaths())#>  "0.2.7.9002"