Merge branch '214-gnuplot-5-4-3' into 'master'

Resolve "gnuplot/5.4.3"

Closes #214

See merge request Pmodules/buildblocks!302

Tools/gnuplot/files/variants

@@ -1,10 +0,0 @@
-gnuplot/4.6.3	stable
-gnuplot/5.0.0	stable
-gnuplot/5.2.0	stable
-gnuplot/5.2.4	stable
-gnuplot/5.2.6	stable
-gnuplot/5.2.7	stable
-gnuplot/5.2.8	stable
-gnuplot/5.4.0	stable
-gnuplot/5.4.1	stable
-gnuplot/5.4.2	stable

Tools/gnuplot/files/variants.yaml

@@ -0,0 +1,19 @@
+overlay: base 
+relstage: stable
+
+gnuplot/4.6.3:
+gnuplot/5.0.0:        
+gnuplot/5.2.0:       
+gnuplot/5.2.4:       
+gnuplot/5.2.6:       
+gnuplot/5.2.7:       
+gnuplot/5.2.8:       
+gnuplot/5.4.0:       
+gnuplot/5.4.1:       
+gnuplot/5.4.2:       
+gnuplot/5.4.3:
+  - relstage: unstable
+    overlay: devel
+    systems: rhel7
+  - systems: rhel6
+