[dsc] dsc v2.13.1 released!

[Jerry Lundström]

Hi all,

This patch release is mainly for build and packages where MaxMind DB 
library is preferred over the legacy GeoIP library.
MaxMind has announced that the databases for GeoIP will be EOL May 2022 
and recommends switching to GeoIP2 databases.

   <https://www.dns-oarc.net/files/dsc/dsc-2.13.1.tar.gz>
   1112ad45a1578c2c04dcec949045f48490bd54bccc4cfa6bf5b7cc2808a5391b

Packages are available at: <https://dev.dns-oarc.net/packages/>

Also updated DSC's description, removing references to the now 
discontinued Presenter and pointing to dsc-datatool instead.

d891e2c Package, description
c23406c Optional GeoIP
26dd506 GeoIP

Cheers,
Jerry