HPCC-8668 Roxie takes a significantly long time loading data

It would appear that we lost the use of IDelayedFile when we refactored Roxie.
On further reflection, the use of delayedFile should really be under the
control of the lazyOpen flag.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
HPCC-8857 Don't create aliases for CSV attributes(!)

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-8856 Fix problems with inactive selectors

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-8857 Add an example

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #3999 from richardkchapman/roxie-lazyopen

HPCC-8668 Roxie takes a significantly long time loading data

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>
Merge pull request #4009 from ghalliday/issue8856

HPCC-8856 Fix problems with inactive selectors

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4010 from ghalliday/issue8857

HPCC-8857 Don't create aliases for CSV attributes(!)

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>
Merge remote-tracking branch 'origin/candidate-3.10.4' into candidate-3.10.x

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>