This gets quite useful, when you have many drives

We create program entries, not only for current, but also all reachable
programs/pid on the same frequency (which are already seen, but skipped
in demux). But we keep only sending events regarding current program.
This allows generating data and displaying EPG entries for all available
channels

With just "skins" and "qt", only those specific interfaces would be
probed. Thus VLC could not be started from X-less command line.

If luarc is mature enough to replace oldrc, then I guess this is not
needed anymore

There's no reasons not to enable DVB support if libdvbpsi is present
and the kernel headers are present. It does not add any dependency over
the TS demux.

DVB headers were merged with Linux 2.5, so there is really no use for
--with-dvb anymore.

This fixes a crash with VoD when all tracks were not set up

This fixes problems with lost characters and failure to close
connections in some cases

No functionnal change

Should fix #4561, thanks to stiger