[DEV-1320_table-names] Prefix all Askbot tables with 'askbot_'.
[DEV-1320] Merge branch 'DEV-1320_table-names_rover-only' into DEV-1320: prefix askbot tables with 'askbot_' where missing.
[DEV-1320] Recreate initial askbotuser migration to reflect changes in table names.
[DEV-1152] Remove duplicated 'User' entry from __all__ in models __init__.
[DEV-1320] Merge branch 'DEV-1152' into DEV-1320: merge in removal of duplicate 'User' in models __all__.