MAINT: deprecate old import

src/caosdb/__init__.py

 """
 Deprecated
 """
+
+from warnings import warn
+
 from linkahead import *
+
+warn(("CaosDB was renamed to LinkAhead. Please import the library as `import linkahead`. Using the"
+      " old name (caosdb) is deprecated."), DeprecationWarning)