emacs: 24.5 -> 25.1

This commit removes all references to emacs24 with the exception of
emacs24-macports. The two folders in `pkgs/applications/editors` named
`emacs-24` and `emacs-24` are consolidated to a new `emacs` folder.

Various parts in nixpkgs also referenced `emacs24Packages` (pinned to
`emacs24`) explicitly where `emacsPackages` (non-pinned) is more
appropriate. These references get fixed by this commit too.

pkgs/development/haskell-modules/configuration-common.nix

@@ -773,7 +773,7 @@ self: super: {
       local lispdir=( "$out/share/"*"-${self.ghc.name}/${drv.pname}-${drv.version}/elisp" )
       pushd >/dev/null $lispdir
       for i in *.el; do
-        emacs -Q -L . -L ${pkgs.emacs24Packages.haskellMode}/share/emacs/site-lisp \
+        emacs -Q -L . -L ${pkgs.emacsPackages.haskellMode}/share/emacs/site-lisp \
           --batch --eval "(byte-compile-disable-warning 'cl-functions)" \
           -f batch-byte-compile $i
       done
@@ -790,7 +790,7 @@ self: super: {
       local lispdir=( "$out/share/"*"-${self.ghc.name}/${drv.pname}-${drv.version}/elisp" )
       pushd >/dev/null $lispdir
       for i in *.el; do
-        emacs -Q -L . -L ${pkgs.emacs24Packages.haskellMode}/share/emacs/site-lisp \
+        emacs -Q -L . -L ${pkgs.emacsPackages.haskellMode}/share/emacs/site-lisp \
           --batch --eval "(byte-compile-disable-warning 'cl-functions)" \
           -f batch-byte-compile $i
       done