With introduction of literal option, two of the three meaningful numeric
levels lost their purpose. In fact, they turned into no-ops so that '-n'
had to be given tree times on commandline to have an effect.
To overcome this, spread the three effects of NFT_NUMERIC_ALL to allow
some selection
Previously, changes to any of the included adoc snippets in nft.txt were
not detected and hence the man page not updated (unless 'make clean' was
called). It seems like the '.txt.8' target only considers foo.txt when
trying to generate foo.8, so get rid of that and introduce a dedicated
target for
Commit 8a7f6de536408 ("meta: fix pkttype name and add 'other' symbol")
deprecated pkt_type value 'unicast' (for it being misleading) and
introduced 'host' and 'other' but it did not update documentation
accordingly. Fix this by replacing 'unicast' with 'host' in
documentation and adding 'other'.
