Return a dictionary with context vars when contextifying a file list. The filename and thumb path are now under 'filename' and 'thumbname' attributes.
Scan exif data and add it to context vars for the file.
Add a 'date' attribute to the return dictionary items, this is the ctime of the file, or the value of exifs DateTime, DateTimeOriginal, or DateTimeDigitized (whichever is available first.)
Convert ctime to a datetime object.
Remove some debug stuff.