Make implicit assignment etc. work for these iterator classes
Make implicit assignment etc. work for these iterator classes

...so they fulfil all the relevant iterator requirements out of the box.

Change-Id: I2a47fa18ba31e9680a2b18285a1640baaf0da40b

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