#8 Add mechanism for stopping runaway query

[Paul Sterk]

Some queries return a very large number of results in
their result set. This situation causes the browser to
hang.

There is currently no way to cancel such a "runaway"
query. The workaround is to kill the browser.

Another feature that could be added to mitigate this
problem involves limiting the maximum number of rows
returned from any query. The max results value could
be set as a property.