Poll not properly updating who voted

Apparently there is some contention between the queue module and the poll module, so this is only a problem when both modules are enabled.

Both modules use a node->voters variable. The queue module defines this as an array, while the poll module defines this as a string. This causes the poll module to only update the poll.voted column with the last user that has voted, so this only disallows the latest voter as the poll.voted column's data is overwritten after each vote.

The best possible fix would probably be to rename the poll.voted column to poll.polled and update the code accordingly. As an interim, I propose the following patch which modifies the query to SELECT votes as polled. This also modifies relevant code to use node->polled instead of node->voted. If the database is modified to accomodate the poll.polled column instead of the poll.voted column, this would then require minimal code change to sync the code to the database.