gnu: r-scales: Move to (gnu packages cran).

* gnu/packages/statistics.scm (r-scales): Move variable from here...
* gnu/packages/cran.scm (r-scales): ...to here.

gnu/packages/cran.scm

@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2015, 2016, 2017, 2018, 2019 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2015 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2016, 2017 Ben Woodcroft <donttrustben@gmail.com>
 ;;; Copyright © 2017, 2018 Roel Janssen <roel@gnu.org>
 ;;; Copyright © 2017, 2018, 2019 Tobias Geerinckx-Rice <me@tobias.gr>
@@ -95,6 +96,32 @@
 the system clipboards.")
     (license license:gpl3)))
 
+(define-public r-scales
+  (package
+    (name "r-scales")
+    (version "1.0.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (cran-uri "scales" version))
+       (sha256
+        (base32 "0353dkh3d7x78463c6ds80hcml59lrqwr8rlv82a8dnkxla4l7qc"))))
+    (build-system r-build-system)
+    (propagated-inputs
+     `(("r-labeling" ,r-labeling)
+       ("r-munsell" ,r-munsell)
+       ("r-rcolorbrewer" ,r-rcolorbrewer)
+       ("r-rcpp" ,r-rcpp)
+       ("r-r6" ,r-r6)
+       ("r-viridislite" ,r-viridislite)))
+    (home-page "https://github.com/hadley/scales")
+    (synopsis "Scale functions for visualization")
+    (description
+     "This package provides graphical scales that map data to aesthetics, and
+provides methods for automatically determining breaks and labels for axes and
+legends.")
+    (license license:expat)))
+
 (define-public r-ellipsis
   (package
     (name "r-ellipsis")

gnu/packages/statistics.scm

@@ -1108,32 +1108,6 @@ the input of another.")
 using just two functions: melt and dcast (or acast).")
     (license license:expat)))
 
-(define-public r-scales
-  (package
-    (name "r-scales")
-    (version "1.0.0")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (cran-uri "scales" version))
-       (sha256
-        (base32 "0353dkh3d7x78463c6ds80hcml59lrqwr8rlv82a8dnkxla4l7qc"))))
-    (build-system r-build-system)
-    (propagated-inputs
-     `(("r-labeling" ,r-labeling)
-       ("r-munsell" ,r-munsell)
-       ("r-rcolorbrewer" ,r-rcolorbrewer)
-       ("r-rcpp" ,r-rcpp)
-       ("r-r6" ,r-r6)
-       ("r-viridislite" ,r-viridislite)))
-    (home-page "https://github.com/hadley/scales")
-    (synopsis "Scale functions for visualization")
-    (description
-     "This package provides graphical scales that map data to aesthetics, and
-provides methods for automatically determining breaks and labels for axes and
-legends.")
-    (license license:expat)))
-
 (define-public r-ggplot2
   (package
     (name "r-ggplot2")