Add description for merged trace

instructions.org

@@ -2,6 +2,8 @@
 4.2. Register-Register Arithmetic Instructions
 --------------------------------------------------------------------------
 
+These do not render well on github, try using your text editor.
+
 * ADD
 
  - Summary   : Addition with 3 GPRs, no overflow exception

src/test/scala/RISCV/printUtils.scala

@@ -347,7 +347,8 @@ object PrintUtils {
 
   def printLogSideBySide(trace: List[ExecutionTraceEvent], chiselTrace: List[CircuitTrace], program: Program): String = {
     import LogParser._
+    val header = "ADDRESS   --   VM UPDATES                                                ---      DEVICE UNDER TEST UPDATES                     ---    CORRESPONDING SOURCE LINE\n"
     val traces = mergeTraces(trace, chiselTrace).map(x => printMergedTraces((x), program))
-    traces.map(_.mkString("\n")).mkString("\n", "\n--------------------------------------------------------------------------+------------------------------------------------------+-------------------------------\n", "\n")
+    "\n" + header + (traces.map(_.mkString("\n")).mkString("\n", "\n--------------------------------------------------------------------------+------------------------------------------------------+-------------------------------\n", "\n"))
   }
 }