Naming the originator in new testcases

[Gabriel Dos Reis]

Wolfgang Bangerth <bangerth@ices.utexas.edu> writes:

| In fact, as Gerald noticed, codingconventions.html says
|     Where appropriate, testsuite entries should include comments giving their
|     origin: the people who added them or submitted the bug report they relate
|     to, possibly with a reference to a PR in our bug tracking system.
| It would be nice if we could keep to this policy.

sounds sensible to me.

-- Gaby