move residual 'remove' code into board_activate (so symmetric with activate)
move residual 'remove' code into board_activate (so symmetric with activate)

8l/connectal,csail-csg/connectal,cambridgehackers/connectal,cambridgehackers/connectal,8l/connectal,hanw/connectal,8l/connectal,hanw/connectal,hanw/connectal,cambridgehackers/connectal,hanw/connectal,8l/connectal,cambridgehackers/connectal,csail-csg/connectal,chenm001/connectal,chenm001/connectal,cambridgehackers/connectal,chenm001/connectal,csail-csg/connectal,8l/connectal,csail-csg/connectal,csail-csg/connectal,hanw/connectal,chenm001/connectal,chenm001/connectal