* Registry queries can fail due to simultaneous access from other
processes. Wrap some of these accesses and retry when this may
be the cause (the generated exceptions don't allow pinpointing
this as the reason, but we add logic to identify cases which
are definitely unrecoverable, and retry if it is not one of
these).
* Add make recursion optioal for most registry search functions;
disable recursive search in case where it was originally always
recursive.
7b9eac02ff