library.tex (internalfunc): Define \internalfunc, which prints a

library.tex (internalfunc): Define \internalfunc, which prints a
	disclaimer in front of "internal functions".  We should
	move them somewhere else, but for now, let's start marking
	those functions which we believe are internal.

krb5.tex: Documented changed interfaces to krb5_encode_kdc_rep
	and krb5_encrypt_tkt_part.  Document krb5_encode_kdc_rep,
	krb5_decode_kdc_rep, krb5_encrypt_tkt_part,
	krb5_decrypt_tkt_part, and krb5_send_tgs as all internal
	functions.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@4708 dc483132-0cff-0310-8789-dd5450dbe970