BUG      Backport of D6 change: Nodes never yet displayed were not included in blocks
   BUG      Backport of D6 change: #231868 : improved support for multiple vocabularies
   QUAL     Various symbol and formatting renaming to match the OSInet coding standards

   BUG      No longer display empty blocks if the default "empty" text is empty too
   QUAL     Remove a warning for empty blocks

   FEAT     Added setting for maximum number of items in block
   FEAT     No longer display the archive link if archive page only contains
            nodes already listed in the block (and not only if it is empty)
   QUAL     Renamed constants to OSInet standard: all caps, no separators,
            persistent variables named <module>VAR<var name>, default values
            named <module>DEF<var name>.
   FEAT     Improved themeability: blocks now have a wrapper with a specific class
            in the builtin theme

   FEAT     Archive link removed if archive is empty

   FEAT     Blocks are now individually themeable

- Remove 4.6-related error condition when configuring taxonews blocks on 4.7 beta