Add equal_to/sort options to nonintrusive trait.
Add equal_to/sort options to nonintrusive trait.

Nonintrusive list uses intrusive list as backend, so it is
required to not break the build.

goswamia/libcds,elventear/libcds,Rapotkinnik/libcds,elventear/libcds,goswamia/libcds,Rapotkinnik/libcds,xinghuwang/libcds,xinghuwang/libcds,xinghuwang/libcds,elventear/libcds,goswamia/libcds,hanbinhu/libcds,xinghuwang/libcds,Rapotkinnik/libcds,eugenyk/libcds,eugenyk/libcds,hanbinhu/libcds,xinghuwang/libcds,goswamia/libcds,Rapotkinnik/libcds,eugenyk/libcds,elventear/libcds,hanbinhu/libcds,Rapotkinnik/libcds,hanbinhu/libcds,eugenyk/libcds,hanbinhu/libcds,goswamia/libcds,eugenyk/libcds,elventear/libcds