inspect should detect when task is Extrauppgift and silently fail

[mosbth]

Remove the warning, but leave text stating that this task was optional.

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-- game1
-- http://dbwebb.se/uppgift/ett-terminal-baserat-spel-i-python-steg1
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Open files in an editor:
vim "/home/mos/dbwebb-kurser/python/me/kmom04/game1"


WARNING The file /home/mos/dbwebb-kurser/python/me/kmom04/game1/border.py is not readable.

Press enter to continue...

At least, think through how to deal with it.