cleanup: remove old files.
support: minor aesthetic change.
dvb: fix disabling of bad muxes caused by dodgy hardware/firmware

because some tuners, mostly USB, can result in ioctl() failures due
to inability to communicate with driver and this was not properly
trapped muxes were being disabled.

Better solution is to reject bad muxes being entered in the first
place based on the tuning capability of the device. Ofc if the
tuner fails to report that correctly (probably) we'll still be
buggered.