examples: added batch

T/O.
examples: added nf-queue

T/O.
examples: change dirname

more understandable
examples: (re)introduce MNL_MMAP_MSGHDR

and fix conflicts I have not noticed, sorry.
examples: reorganize dirs

to write Makefile
mmap: advance or not

I have almost fogotten. build_frame does not advance, parse_frame
advances even though on cb error.
mmap: nl_mmap_hdr to nlmsghdr macro

cast void *, not nlmsghdr
examples: Makefile for not minimum [nonmin2] and depart from minimum [nonmin3]

and added nf-log, nfct-dump