Fetch CVE information from cve.org

Changes for 0.007 - 2023-10-17

• Transfered authority to CPAN-Security
• Update docs for groff-1.24
• Better SKIP in xt (pr#10, Haelwenn)
• Skip NETWORK tests when NO_NETWORK_TESTING (pr#10 Haelwenn)
• More output formats for cve.pl (and text output for -f)