koheiextref01: #i109168# Allow creation of static sheet cache via UNO API for external references.
koheiextref01: #i109168# Allow creation of static sheet cache via UNO API for external references.

This is to keep the sheet cache 'static' during import of xlsx documents.  The same trick
is performed during import of xls and ods documents.
JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core