cubicweb #1896721 changing the name of a source makes problems [resolved]

the table entities is de-normalized and its column asource (actual source) refers to the source name instead of the source eid. it means that when the source name is changed, a hook should update the column asource of the table entities and clear the cache.

done in3.13.4
load left0.000
closed by#71adfd6bab38 [source] update system table and internal structures on source renaming. Closes #1896721