[ipv6calc] Release 4.4.0 - IP2Location 8.7.0

Hi all, https://github.com/pbiering/ipv6calc/releases/tag/4.4.0 General: internal databases: update IP2Location 8.7.0 related (relates to https://github.com/chrislim2888/IP2Location-C-Library/releases/tag/8.7.0 which has unfortunatly incompatible API changes) ipv6calcweb/ipv6calcweb.cgi.in: add support for new fields in DB26 with 8.7.0 add support for additional data in DB26 usable with IP2Location >= 8.7.0 check IP2Location > 8.6.1 related compatibility/fallback Extensions: add option --has-feature <NAME> Regards,     Peter