[dsc] DSC release 2.7.0

[Jerry Lundström]

Hi all,

Add support for Linux "cooked" capture encapsulation (`DLT_LINUX_SLL`).

  https://www.dns-oarc.net/files/dsc/dsc-2.7.0.tar.gz
  eab7f79229a800087d96cb8bac39927558f1d512428d7825d5edb5f7064d2c31

Packages are available at:

  https://dev.dns-oarc.net/packages/

Fixes:
- `grok_question()`: Remove usage of `strcpy()`
- `pcap_tcp_handler()`: Use `snprintf()`
- `printable_dnsname()`: Use `snprintf()`
- Fix CID 104450, 186871

Commits:
41d59ac man-page HTML
476d6ed pcap_layers, CID
747131b Configure options
43c9ad0 DLT_LINUX_SLL
8a48667 Support the linux cooked sll frame
bd4a94f Fix CID 104450

Cheers,
Jerry