tdt: ignore other network in NIT this causes havoc with DVB-S networks.

This is particularly true where the other network is only available
via another orbital position (we could check for this) but it also
causes problems with other transmission types so I think we'll just
ignore for now.
(cherry picked from commit 3581869d83831f80dd7564ea4bb2a25b68ecf087)
docs: update documentation with new domain name and paypal link
(cherry picked from commit 89b18c05ca4a351db0f4ba8c423e9ec29759cd94)

Conflicts:

	docs/html/overview.html
	docs/html/sysreq.html
	support/changelog
docs: some minor documentation updates
(cherry picked from commit d4883d9d6b3eb8ed1b0e85aeb4d297028c91e830)
dvb: remove the create only tv/radio services, this was a bad idea!
(cherry picked from commit c83b0cba2f0c8092b6a96828aef327ec8bb4c3b4)

Conflicts:

	src/dvb/dvb_tables.c