InDetIdentifier: Remove need for MT-unsafe set_do_checks().
set_do_checks() is not thread-safe when used on a const object. For the methods that can do checking, add versions that take an extra bool argument to force checking either on or off.
set_do_checks() is not thread-safe when used on a const object. For the methods that can do checking, add versions that take an extra bool argument to force checking either on or off.