mercurial: ship mercurialFull

not sure _entirely_ what it adds though

hosts/common/programs/mercurial.nix

@@ -1,6 +1,8 @@
-{ ... }:
+{ pkgs, ... }:
 {
   sane.programs.mercurial = {
+    packageUnwrapped = pkgs.mercurialFull;
+    sandbox.wrapperType = "inplace";  # etc/mercurial/hgrc refers to hg python-path (to define an extension)
     suggestedPrograms = [
       "less"  #< TODO: this might be a missing dependency on the nix side of things?
     ];