cron: Fixes (correct month / day bitmaps and the days_in_month check)
webui: avoid NULL dereference for /play url if remain is NULL
epggrab: test code for only tuning muxes that require it
epggrab: fix the missing variable initialization and NULL dereference
epggrab: eit - fix the shutdown sequence
epggrab: fix a memory leak for ota mux
epggrab: improve the tune callback, do tsid check for opentv
epggrab: otamux - save linked services, too
epggrab / eit: add automatic linked service removal
epggrab: ota - move service lists from ota to map

- also use service filter for uk_freesat / viasat_baltic
epggrab: increase default timeout to 600 seconds (10 minutes)
epggrab: ota - remove timeout / interval per module / per ota mux config
cron, internal epggrab: add multi-line cron support for internal epggrab
epggrab: ota - change the subscription scheme

- now all muxes are handled continuously in one queue
- the queue can be kicked using the start time
epggrab: ota - add multi-line cron scheduler

- the initial EPG scan can be turned off in webui
- the OTA mux timeout is configurable through webui
epggrab / mpegts mux: allow to force EPG scan per mux
webui: epggrab - do not collapse panels by default