renamed DDRFile->DDRLocalFile for consistency

Matches DDRLocalCollection and DDRLocalEntity.
renamed DDRFile->DDRLocalFile for consistency

Matches DDRLocalCollection and DDRLocalEntity.
added inheritable_fields() and inherit() to coll/ent/files
moved inheritable_fields() and inherit() to ddr-cmdln

Kept the Django-specific forms-processing parts here in ddr-local
pass form fields directly to add_file instead of hard-coding

Certain fields like rights were not cut-and-pasted through the
entire chain from view GET, POST, to add_file() task.
This change takes form.cleaned_data, pops out path and role,
and passes it into the functions as a dict.
new entities and files now inherit values from their parents

Entities and Files now inherit inheritable values from their parent
Collections or Entites when they are created.