writing R without knowing R.
the seed file is created in Rsandbox, but it uses the pathname passed as testname. Want to just get the basename from that path, otherwise the created sandbox file has dirs that don't exist. basically I think the R stuff was going down the path of requiring testname to be in the current directory, but runner_Runit.sh doesn't want to go in the dirs of all the tests...so the test name arg really is a pathname, and should be used assuming that.
used R basename(). seems to work for my case. don't know if it breaks some other R runner? shouldn't ?