merge r6311 from branch 2.1 to trunk
bug 1683 fixed: as soon as an admin modifies the admin>conf>options>guest settings, registration is broken. This is because user_infos.theme/language are emptied (while they should not).
I have also added an "automatic repair" piece of code in get_default_user_info function. This piece of code should be removed for 2.2 with the appropriate migration task.
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