ncd: modules: value: add value::insert_remove(). Also fix crash introduced in previous commit.
ncd: modules: value: add value::insert_remove(). Also fix crash introduced in previous commit.


linfengfeiye/badvpn,linfengfeiye/badvpn,linfengfeiye/badvpn,LazyZhu/badvpn,tempbottle/badvpn,PowerOlive/badvpn,chrisballinger/badvpn,binondord/badvpn,chrisballinger/badvpn,chrisballinger/badvpn,Git-Host/badvpn,Git-Host/badvpn,binondord/badvpn,LazyZhu/badvpn,tempbottle/badvpn,tempbottle/badvpn,LazyZhu/badvpn,binondord/badvpn,chrisballinger/badvpn,PowerOlive/badvpn,tempbottle/badvpn,linfengfeiye/badvpn,PowerOlive/badvpn,Git-Host/badvpn,PowerOlive/badvpn,PowerOlive/badvpn,LazyZhu/badvpn,binondord/badvpn,linfengfeiye/badvpn,tempbottle/badvpn,binondord/badvpn,Git-Host/badvpn,Git-Host/badvpn,LazyZhu/badvpn