karsten's second refactoring patch

src/or/buffers.c

src/or/config.c

src/or/connection_edge.c

src/or/directory.c

src/or/dirserv.c

src/or/dns.c

src/or/or.h

src/or/rendclient.c

src/or/rendcommon.c

src/or/rendmid.c

src/or/rendservice.c

src/or/rephist.c

src/or/routerlist.c

src/or/routerparse.c

src/or/test.c