dvb: forgot to pass netname to sat mux_create
SNR support for all TBS tuners

Drivers fot TBS tuner support SNR
this change work for all models ;)
dvb: re-instate some of the form scanning code.

Mux TSID and ONID can now be updated from other tables if, and only if,
they values are not yet set. Values from the NIT will ALWAYS override
existing values, as they're hopefully more reliable.
dvb: close dvr device on each re-tune
dvr: don't run postproc script unless there is actually a file to process
docs: updated the README and add markdown
Merge remote-tracking branch 'origin/pr/240'
docs: reinstate original README
dvb: add adapter bandwidth to status page.
Revert "dvb: close dvr device on each re-tune"

This reverts commit 03e9f1179d67bd2b4ccd7a0f3fd9c5fc039c0d5c.
cwc: remove duplicate lock causing deadlock on cwc entry delete
Merge branch 'master' of https://github.com/tvheadend/tvheadend