Preference Access Levels

WIP for .20 (?) -fox

• 0 - Basic
• 1 - Intermediate
• 2 - Advanced

• ENABLE_FEED_ICONS - 0
• PURGE_OLD_DAYS - 1
• UPDATE_POST_ON_CHECKSUM_CHANGE - 2
• ENABLE_LABELS - 2
• DEFAULT_UPDATE_INTERVAL - 2
• DEFAULT_ARTICLE_LIMIT - 1
• ALLOW_DUPLICATE_POSTS - 0
• USER_STYLESHEET_URL - 0
• ENABLE_FEED_CATS - 0
• SHOW_CONTENT_PREVIEW - 1
• SHORT_DATE_FORMAT - 2
• LONG_DATE_FORMAT - 2
• HEADLINES_SMART_DATE - 0
• COMBINED_DISPLAY_MODE - 0
• HIDE_READ_FEEDS - 0
• OPEN_LINKS_IN_NEW_WINDOW - 1
• ON_CATCHUP_SHOW_NEXT_FEED - 1
• FEEDS_SORT_BY_UNREAD - 0
• EXTENDED_FEEDLIST - 2
• MARK_UNREAD_ON_UPDATE - 2
• REVERSE_HEADLINES - 1
• DIGEST_ENABLE - 0
• CONFIRM_FEED_CATCHUP - 1
• CDM_AUTO_CATCHUP - 1
• STRIP_UNSAFE_TAGS - 0
• BLACKLISTED_TAGS - 1
• ENABLE_SEARCH_TOOLBAR - 1
• FRESH_ARTICLE_MAX_AGE
• DIGEST_CATCHUP - 0
• CDM_EXPANDED - 1
• PURGE_UNREAD_ARTICLES - 1
• HIDE_READ_SHOWS_SPECIAL - 1