HPCC-8787 Refresh Page with a Invalid Hash String

Refreshing a page with an invalid (or out of date) "#" value would cause the
page to hang or to not display at all.

Fixes HPCC-8787

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
HPCC-8802 Implement RECORDOF(dictionary)

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-8807 Implement typedefs for dictionary and datasets

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>