Tweaked tetrad theme colors for 6 row time display

source/less/Variables.less

@@ -14,6 +14,13 @@
 @color-theme-triad1:			spin(@color-theme, -135);
 @color-theme-triad2:			spin(@color-theme, 135);
 
+@color-theme-tetrad1:			spin(@color-theme, 180);
+@color-theme-tetrad2:			spin(@color-theme, 150);
+@color-theme-tetrad3:			spin(@color-theme, 30);
+@color-theme-tetrad4:			spin(@color-theme, 210);
+@color-theme-tetrad5:			spin(@color-theme, -30);
+@color-theme-tetrad6:			@color-theme;
+
 @color-theme-tetra1:			spin(@color-theme, -90);
 @color-theme-tetra2:			spin(@color-theme, 90);