Rename testfiles after the l3str/l3str-convert split


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4417 de43f980-851b-0410-b2f7-c40aca1f87e0
Change the prop quark to a scan mark to simplify expansion


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4418 de43f980-851b-0410-b2f7-c40aca1f87e0