Draft: file system: cleanup

Summary

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src/caosdb/common/models.py

 
 from linkahead.common.models import *
 from warnings import warn
+from lxml import etree
 
 warn(("CaosDB was renamed to LinkAhead. Please import this library as `import linkahead.common.models`. Using the"
       " old name, starting with caosdb, is deprecated."), DeprecationWarning)