Result set handling bugs

[Rod Widdowson]

> My biggest review need is the PluginDependencySupport thing, because I
> just slammed the refactor into that class.

Noted.  That code is very opaque - in general if you think it's broken you
don't understand it.  As I recall there are some inferred state
dependencies.  I'll check that over very close.

> We also need to carefully compare old and new plugins

OK I'll add them to the list (I'll keep clear of LDAP though..)

R