darcs 2.12.1 release

The Darcs team is pleased to announce the release of Darcs 2.12.1!

The most important changes are:

• fixes for building with GHC 8

• drop support for GHC 7.6 and 7.8, i.e., require GHC 7.10

• improvements in `darcs whatsnew` output with irrelevant files (Ben Franksen)

This release can be installed via cabal or (soon) stack. The 2.12 branch is also available as a darcs repository from http://darcs.net/releases/branch-2.12 .