优化 回帖奖励以及附件表字段扩容

* 优化 附件表字段长度延长* 优化 回帖奖励字段延长

1. ALTER TABLE `pre_forum_activity` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL DEFAULT '0';
   
2. ALTER TABLE `pre_forum_attachment` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;
   
3. ALTER TABLE `pre_forum_attachment_0` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;
   
4. ALTER TABLE `pre_forum_attachment_1` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;
   
5. ALTER TABLE `pre_forum_attachment_2` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;
   
6. ALTER TABLE `pre_forum_attachment_3` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;
   
7. ALTER TABLE `pre_forum_attachment_4` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;
   
8. ALTER TABLE `pre_forum_attachment_5` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;
   
9. ALTER TABLE `pre_forum_attachment_6` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;
   
10. ALTER TABLE `pre_forum_attachment_7` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;
    
11. ALTER TABLE `pre_forum_attachment_8` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;
    
12. ALTER TABLE `pre_forum_attachment_9` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;
    
13. ALTER TABLE `pre_forum_attachment_exif` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL;
    
14. ALTER TABLE `pre_forum_attachment_unused` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL;
    
15. ALTER TABLE `pre_forum_forumrecommend` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL DEFAULT '0';
    
16. ALTER TABLE `pre_forum_replycredit` CHANGE `extcredits` `extcredits` INT(10) UNSIGNED NOT NULL DEFAULT '0';
    
17. ALTER TABLE `pre_forum_replycredit` CHANGE `times` `times` INT(10) UNSIGNED NOT NULL DEFAULT '0';
    
18. ALTER TABLE `pre_forum_replycredit` CHANGE `membertimes` `membertimes` INT(10) UNSIGNED NOT NULL DEFAULT '0';
    
19. ALTER TABLE `pre_forum_thread` CHANGE `replycredit` `replycredit` INT(10) NOT NULL DEFAULT '0';
    
20. ALTER TABLE `pre_forum_trade` CHANGE `aid` `aid` INT(10) UNSIGNED NOT NULL;