make sure filename header in pdf atthments only contains ascii characters.
replace ? by _ as replacement char in nonascii filenames
return id_source as filename when encounters UnicodeEncodeError
replace space by _ in filename
update place where >1 result can be returned if several memberships get created for the same user and ensemble (by mistake).
fix for encrypted PDFs
add ref
disable iframe for openid for now
dont fail $.E if input string null or undefined
sanitize email address
fix bug: After login we're successfully logged in but username is still showing guest.