- Fixed 1.0 regression where a "deferred" attribute would not populate

- Fixed 1.0 regression where a "deferred" attribute would not populate
correctly if it were loaded within the "optimized inheritance load",
which is a special SELECT emitted in the case of joined table
inheritance used to populate expired or unloaded attributes against
a joined table without loading the base table.  This is related to
the fact that SQLA 1.0 no longer guesses about loading deferred
columns and must be directed explicitly.
fixes #3468