title, attribution; store in title and longdesc attributes; display as figure with figcaption elements

autofill attribution from exif information

step 1) update WYMeditor image dialog with "attribution"
step 2) save attribution as longdesc attribute at the image
step 3) create and add figcaption element from longdesc attribute
step 4) set "cc: author (date)" as placeholder for "attribution"
step 5) read exif data to autofill "attribution"