- rewrite --dropfirst to be more industrial strength, includes views
- fix order_by="foreign_key" to maintain the same ordering as
metadata.sorted_tables.   Not ideal that this was the other way throughout
0.7 but this is still a little-used method, in contrast to metadata.sorted_tables.

convert non-string values to string, to accommodate
old SQLite versions that don't deliver
default info as a string.  [ticket:2265]
- factor sqlite column reflection to be like we did for postgresql,
in a separate method.

- struggle with Operators class autodoc

reflection" system has been moved into the
declarative extension itself, using the
new DeferredReflection class.  This
class is now tested with both single
and joined table inheritance use cases.
[ticket:2485]
- [bug] The autoload_replace flag on Table,
when False, will cause any reflected foreign key
constraints which refer to already-declared
columns to be skipped, assuming that the
in-Python declared column will take over
the task of specifying in-Python ForeignKey
or ForeignKeyConstraint declarations.

deprecated; use Inspector.get_pk_constraint().
Courtesy Diana Clarke.  [ticket:2422]
- restored default get_primary_keys()/get_pk_constraint() wrapper
to help maintain compatibility with third party dialects
created against 0.6 or 0.7