HPCC-12470 Document IMPORT ^ syntax

Signed-off-by: Jim DeFabia <jamesdefabia@lexisnexis.com>
HPCC-12415 Excessive tracing from cassandra plugin

Added the ability to control the logging level within plugins, and to capture
logging from those plugins via the standard capture mechanisms.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
HPCC-12470 Edits based upon review

Signed-off-by: Jim DeFabia <jamesdefabia@lexisnexis.com>
Merge pull request #6594 from JamesDeFabia/12470DocsImportCaret

HPCC-12470 Document IMPORT ^ syntax

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>
Merge pull request #6571 from richardkchapman/cassandra-verbose

HPCC-12415 Excessive tracing from cassandra plugin

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>