In practice, check if the given Python package is installed (which is
normally done at rkeops package install).
Should be used to test the availability of keopscore and of pykeops
packages.
check_pypkg(package, warn = TRUE)boolean value indicating if the pykeops package is available.
character string, name of package to be checked among
"keopscore" and "pykeops".
boolean, if TRUE (default), warn user about check result.
Ghislain Durif