Reannotation = crash

Recipe =

checkout main, install.
run plom-demo
fire up plom-client
annotate 2 questions and then go back to marker
attempt to reannotate the first one.

= Boom.

Traceback (most recent call last):
  File "/home/andrew/.local/lib/python3.9/site-packages/plom/client/marker.py", line 1664, in annotateTest
    inidata = self.getDataForAnnotator(task)
  File "/home/andrew/.local/lib/python3.9/site-packages/plom/client/marker.py", line 1708, in getDataForAnnotator
    shutil.copyfile(oldaname, aname)
  File "/usr/lib/python3.9/shutil.py", line 265, in copyfile
    with open(src, 'rb') as fsrc, open(dst, 'wb') as fdst:
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/plom_ctodieaf/0003g1_jlfclijx/G0003g1.png'