Change EAD langusage import.

Make script and language the default destination if no
encodinganalog is specified. Fixes #4431, #4508.
Remove reference to dbname, fixes #4970
Fix migration err when menu nodes cannot be found
Avoid treeview node dups, ref #4409
Cosmetic changes
Update term treeview

Apply same changes that we've introduced in the informationobject
treeview recently where child-levels are shown by default.