Search a function and retrieve it.
findGetFunction(fName, package, debug = FALSE)function. The (first) package name where it was found is returned as an attribute named "package"
character with the name of the function
character with the package name
logical indicating if it is to print intermediate progress finding
if 'missing(package)' it will search on the loaded
packages, first in the exported functions, and then
among the non-exported ones.
NOTE: 'package' can include any installed package,
see installed.packages()