NixOS: Add meta.maintainer option to modules.
Tilda (version 1.1.12): New Package

Tida is a GTK-based drop-down terminal emulator
tilda: fixups; seems to work now

- xgettext hack inspired by a guix thread
- gsettings to prevent crashes
- expression refactoring
gnutls: Update to 3.1.26 and 3.2.17.
Revert "nixos/release: Dynamically generate installer tests"

This reverts commit 5870ae613f42c99456dcbbc4df01abdce3c1f448.

It makes it hard to comment out installer tests.
Fix evaluation of nixos tested
haskell-classy-prelude-conduit: update to version 0.9.4
haskell-classy-prelude: update to version 0.9.4
haskell-foldl: update to version 1.0.6
haskell-highlighting-kate: update to version 0.5.9
haskell-interpolate: update to version 0.0.4
haskell-mmorph: update to version 1.0.4
haskell-project-template: update to version 0.1.4.2
haskell-pwstore-fast: update to version 2.4.2
haskell-yaml: update to version 0.8.9.1
haskell-hlint: update to version 1.9.4
haskell-cgi: add version 3001.2.0.0
haskell-pwstore-fast: update to version 2.4.3
haskell-hspec-meta: update to version 1.11.4
haskell-hspec-wai: update to version 0.3.0.1