Minor changes:
ipv6calc/ipv6calc.c
- add auto-output format detection for revnibble
- do not print resultstring, if empty
- add support for '-m' for '--in -?'
- add support for '-m' for '--out|action -?'
ipv6calc/test_ipv6calc.sh
- add input validation tests
lib/ipv6calchelp.[ch]
- support machine readable output for input types
- support machine readable output for output/action types
lib/libipv4addr.c
lib/libipv6addr.c
lib/librfc1886.c
- improve input validation
databases/registries/update-registries.sh
- fix IANA ipv6-unicast-address-assignments weblink problem
05f535340f