remove an arbitrary level of nested parentheses
remove an arbitrary level of nested parentheses

not only one.

Change-Id: I1f611dda6a98fb6244409c0cd1fc87fc9dfaa8c3

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