* Fyorl/feature/attach-dl: (75 commits)
[feature/attach-dl] Removed the use of some abbreviations
[feature/attach-dl] Changed $files_added checks
[feature/attach-dl] Renamed $post_id to $post_msg_id
[feature/attach-dl] Fixed a comment
[feature/attach-dl] Optimised an sql query
[feature/attach-dl] Fixed the logic in an sql statement
[feature/attch-dl] $forum_id cast to int
[feature/attach-dl] Fixed $file_added to $files_added
[feature/attach-dl] Moved definition of $archive_name
[feature/attach-dl] Swapped the order of an if statement
[feature/attach-dl] Cast variables to int
[feature/attach-dl] Added $archive_path
[feature/attach-dl] Used COMMA_SEPARATOR instead of actual comma
[feature/attach-dl] Renamed $count to $files_added
[feature/attach-dl] Removed sprintf() use
[feature/attach-dl] Removed need for array_keys()
[feature/attach-dl] Added multiple attachment downloads to PMs
[feature/attach-dl] Removed reliance on current($row)
[feature/attach-dl] Renamed to phpbb_download_handle_forum_auth
[feature/attach-dl] Moved PM authentication handling into own function
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