Wording: rename "whole"/"part" role types (#67).

BREAKING CHANGES

6 role types and their URIs are renamed:
    - "dm4.core.whole"             -> "dm4.core.parent"
    - "dm4.core.part"              -> "dm4.core.child"
    - "dm4.core.whole_type"        -> "dm4.core.parent_type"
    - "dm4.core.part_type"         -> "dm4.core.child_type"
    - "dm4.core.whole_cardinality" -> "dm4.core.parent_cardinality"
    - "dm4.core.part_cardinality"  -> "dm4.core.child_cardinality"

You must serach/replace your code for that URIs.
You must reset the DB.

See ticket 67.