Fixes for the programmer's manual.

conf/cf-lex.l

conf/conf.c

doc/prog-intro.sgml

doc/tex/birddoc.sty

filter/filter.c

lib/ip.c

lib/resource.sgml

nest/cli.c

nest/proto.sgml

nest/rt-table.c

proto/ospf/ospf.c

proto/static/static.c

sysdep/unix/krt.c

sysdep/unix/log.c