ATRONIX: Copy the whole union in the series

On 64-bit systems, "size" is 32-bit long, and the anonymous union is
64-bit long, just copying "size" in Prop_Series is not enough. Adding a
new field "all" in the union for this purpose.

This fixes a crash appending a value to a map!. Because the map! uses
"series" in the union, and Prop_Series only copies half of it (by
copying the "size" member), later access to "series" results in a
segment fault

(cherry picked from commit d7a6524)

src/core/m-pools.c

@@ -567,7 +567,7 @@ const REBPOOLSPEC Mem_Pool_Spec[MAX_POOLS] =
 ***********************************************************************/
 {
 	newser->info = oldser->info;
-	newser->size = oldser->size;
+	newser->all = oldser->all;
 #ifdef SERIES_LABELS
 	newser->label = oldser->label;
 #endif