#189418 reported by sanduhrs: Poll settings only available for users with "administer nodes" permission.

#199103: Restore the ability to delete choices (regression due to the advpoll_choices refactoring patch).

#100427: Make validation to check if user has already voted work. Also removed some JS that were in place to prevent this, since it's not needed any more.

#196864: Increase the length limit of poll choices from 128 to 2,048 and allow the limit to be customized by a Drupal variable.

#190607 by me: Refactor the advpoll_choices db table. Rename vote_offset to weight, change it to not null & remove its extra key, and add an auto_increment id to each choice.

#182339: Properly check if default values are set. Fixes a bug where maximum choices couldn't be set to 0 (No limit).