ad 6.x-2.0-beta5

New features:

• feature #418382: make per-ad-type default permissions also per-role; introduce 'grant default per ad type permissions' permission; introduce 'edit any advertisements', 'delete own advertisement', and 'delete any advertisements' permissions

Bug fixes:

• bug #418758: validate that $group is an array before treating it as one
• properly display advertisement in reports
• bug #417414: properly save autoactivate and autoexpire timestamps
• bug #417512: implement hook_mail so that notifications are actually sent, use proper variable names in emails; renamed token_ad.inc to ad_token.inc to match the ad module's naming standards; cleanup logic to always return a value even if 0; remove nonexistent this_week_impressions and this_week_clicks variables; replace old variables with new variables in already existing notifications