#1855 - copy image height/width/etc to comments

http://www.getid3.org/phpBB3/viewtopic.php?t=1855
Where data is available, replicate these keys to [comments][picture]
entry:
'data', 'image_mime', 'image_width', 'image_height', 'imagetype',
'picturetype', 'description', 'datalength'