Review loading of thumbnails. (see #10748)
Do not load thumbnails for image with X*Y>2k*2k (see #10748)
Fix loading of thumbnails for bird eye view and fields (see #11071)
Do not set the default for the thumbnails.
Remove commented out code.
Do not specify the user's ID.
Remove casting.
Create a thumbnail store.
Add support for multiple thumbnail loaders.
Add doc and clean code.
Pass reference to the logger.
Add method to NullRenderingService.
Close service and handle exception.
Sets the rendering settings of the specified user.
Add method to NullService.
Re-remove synchronized from retrieveThumbnail
Escape analysis on ThumbnailStorePrx

Track the exit of the store out of the Connector
and surround with a try/finally as much as possible.
It's a bit unclear if there is anything that can
cause the the BatchCall to not proceed until "last"
is true. If there is, that should be handled too.