- The value of version_id_col can be changed

- The value of version_id_col can be changed
manually, and this will result in an UPDATE
of the row.  Versioned UPDATEs and DELETEs
now use the "committed" value of the
version_id_col in the WHERE clause and
not the pending changed value. The
version generator is also bypassed if
manual changes are present on the attribute.
[ticket:1857]
- ensure before_update/after_update called on parent
for collection change