[AndyB] Attach count check 1.0

Checks for proper value in attach_count field in xf_post table.

Fixes an issue where an embedded attachment shows only as a link, but clicking the link will show the image. To fix this issue, this add-on will check for proper value in attach_count field in xf_post table. If incorrect values are found the add-on will provide a link to update all the fields with the correct value.

How to use:
Only those with Administrator privileges can run this add-on.
Add 'attachcountcheck' to your forum URL.
If posts with incorrect values are found, click the update link to fix them.