Move Uu characters to better locations

[ThothDroid]

I used a python script to automatically connect the signs from their unicode filename to the Gardiner code.
All signs which could not be assigned to a Gardiner code got the Code Uuxxx while xxx is a number constantly increasing. But most of the characters have a Gardiner code and got in that category because of inconsistence in the dataset.

The signs have to be moved manually in a suitable category.