fix allow-recursion/allow-query-cache inheritance

fix allow-recursion/allow-query-cache inheritance

the merging of options and defaults into the effective configuration
broke the mutual inheritance of the allow-recursion, allow-query, and
allow-query-cache ACLs, and of the allow-recursion-on and
allow-query-cache-on ACLs.

this has been corrected by adding a 'cloned' flag to the cfg_obj
structure to indicate whether it was configured explicitly or
cloned from the defaults during parsing. we can then adjust the
ACLs while configuring a view, favoring user-configured values
when they're available over cloned defaults.

currently the adjustments to the ACLs are done in configure_view();
later they'll be moved into the effective configuration and this
special handling can be removed.