Fixes to the progdoc.

conf/cf-lex.l

conf/conf.c

doc/prog-intro.sgml

lib/event.c

lib/resource.sgml

lib/slab.c

nest/cli.c

nest/locks.c

nest/neighbor.c

nest/proto-hooks.c

nest/proto.sgml

nest/rt-fib.c

nest/rt-table.c

proto/bgp/bgp.c

proto/rip/rip.c

sysdep/unix/io.c

sysdep/unix/krt.c