added mkMemServer, which can take nil for read or write clients, and fixed compilation of mkSimpleMemServer
added mkMemServer, which can take nil for read or write clients, and fixed compilation of mkSimpleMemServer

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