Clear after returning the byte array (see #11072)
Returns the value from ThumbnailContext method.
Change date in header.
Add test to load thumbnail, reset settings and reload thumbnails.
Clean up tests.
Clear after saving thumbnail.
Add clear after each methods returning thumbnails.
Loop to import several images
Merge pull request #1283 from jburel/thumbnailbean-dev_4_4

Thumbnailbean dev 4 4