Various minor improvements to querying and logging

- Allow use of "both" as a query parameter. This will search for created and destroyed blocks, but not chestaccess. This is useful for situations where the query defaults to "all" e.g. rollbacks. Fixes #210, #252
- Add block negation query parameter. Like with player names, you can now precede a block name with "!" to query for all except the specified blocks. Fixes #452, #216
- Allow use of area parameter with location parameter, as long as location is specified first. Fixes #458
- Better error when asking for kill log without world specified
- Don't try to process events where the block is null.  Fixes #463
- Replace problematic characters in world names with underscores when deciding on a default table name.  Fixes #409
- Adjust for cocoa beans having reversed attachment direction in smart logging