#2486, Add @absoluteEM sizes to help clarify ambiguity in sizing, fix label sizing

src/themes/default/elements/label.variables

@@ -221,7 +221,7 @@
 @tiny    : @10px;
 @small   : @11px;
 @medium  : @12px;
-@large   : @medium;
-@big     : @large;
-@huge    : @big;
-@massive : @huge;
+@large   : @absoluteMedium;
+@big     : @absoluteBig;
+@huge    : @absoluteHuge;
+@massive : @absoluteMassive;

src/themes/default/globals/site.variables

@@ -330,7 +330,7 @@
        Em Sizes
 --------------------*/
 
-/* Exact pixel values expressed in em */
+/* Rounds sizes to closest pixel, then expresses that exact value in terms of @emSize */
 @mini            : unit( round(@miniSize * @emSize) / @emSize, rem);
 @tiny            : unit( round(@tinySize * @emSize) / @emSize, rem);
 @small           : unit( round(@smallSize * @emSize) / @emSize, rem);
@@ -340,6 +340,7 @@
 @huge            : unit( round(@hugeSize * @emSize) / @emSize, rem);
 @massive         : unit( round(@massiveSize * @emSize) / @emSize, rem);
 
+/* em */
 @relativeMini    : unit( round(@miniSize * @emSize) / @emSize, em);
 @relativeTiny    : unit( round(@tinySize * @emSize) / @emSize, em);
 @relativeSmall   : unit( round(@smallSize * @emSize) / @emSize, em);
@@ -349,6 +350,16 @@
 @relativeHuge    : unit( round(@hugeSize * @emSize) / @emSize, em);
 @relativeMassive : unit( round(@massiveSize * @emSize) / @emSize, em);
 
+/* rem */
+@absoluteMini    : unit( round(@miniSize * @emSize) / @emSize, rem);
+@absoluteTiny    : unit( round(@tinySize * @emSize) / @emSize, rem);
+@absoluteSmall   : unit( round(@smallSize * @emSize) / @emSize, rem);
+@absoluteMedium  : unit( round(@mediumSize * @emSize) / @emSize, rem);
+@absoluteLarge   : unit( round(@largeSize * @emSize) / @emSize, rem);
+@absoluteBig     : unit( round(@bigSize * @emSize) / @emSize, rem);
+@absoluteHuge    : unit( round(@hugeSize * @emSize) / @emSize, rem);
+@absoluteMassive : unit( round(@massiveSize * @emSize) / @emSize, rem);
+
 
 /*-------------------
   Exact Pixel Values