The problem was with the non-UTF-8-safe way that a question name
was being constructed from the question text.
I have done a proper fix with methods in the base class to
carefully construct a question name that is reasonable, and
which will fit in the database column. Then I have changed all
importers to use the new methods.
I also remembered not to break the lesson in the process.
Conflicts:
question/type/upgrade.txt
There were already one just added upgrade.txt file so this ended
conflicting. Reviewed the contents, I've deleted the less detailed
note about pluginname, leaving the longer description added by Tim.
Ciao :-)