various small fixes

- fix some earlyInit and initModules methods
- remove some comments
- change name of Done unique value to 'Done', this seems more
  useful for __repr__ and debug logging

Change-Id: I73f0e09bfef858ddca11bba0e92e941ebc151160
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/27907
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

secop/datatypes.py

@@ -879,6 +879,8 @@ class StructOf(DataType):
     :param optional: a list of optional members
     :param members: names as keys and types as values for all members
     """
+    # Remark: assignment of parameters containing partial structs in their datatype
+    # are (and can) not be handled here! This has to be done manually in the write method
     def __init__(self, optional=None, **members):
         super().__init__()
         self.members = members