OUString: constify, avoid temporaries and concatenated appends
OUString: constify, avoid temporaries and concatenated appends

Change-Id: I0282183ab961784623b537a3f0531dd793d05f81

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core