Update to look for attribute name change from actual_wavelength to

centroid_wavelength in mfrsr.b1 files.

Hardcode path to IDL 8.6 until a better solution can be implemented.

src/langley.c

@@ -620,8 +620,9 @@ void create_quicklooks (void)
 	   * Create the name of the batch file, as well as the command 
 	   * Note that the output from IDL will go to stdout.
 	   */
-	  sprintf (command, "%s/bin/idl", getenv ("IDL_DIR"));
-	  sprintf (argument, "-em=%s/%s_batch.sav", getenv ("IDL_SAV_DIR"),
+	  // sprintf (command, "%s/bin/idl", getenv ("IDL_DIR"));
+	  sprintf (command, "/apps/base/rsi/idl86/bin/idl");
+	  sprintf (argument, "-rt=%s/bytecode/%s_batch.sav", getenv("VAP_HOME"),
 		   vapname);
 	  /*
 	   * Execute the IDL command.  If successful, the exit of the 
@@ -898,6 +899,15 @@ void getWavelengthAttr (DATA *D)
    */
   for (r = 0; r < (NCHANNELS - 1); r++)
     {
+      foo = (char *)bw_GetAttrValue (D, 
+				     B1,
+				     0, 
+				     IN_CHN1 + r, 
+				     "centroid_wavelength", 
+				     NULL, 
+				     NULL);
+
+      if (foo == NULL) {
 	  foo = (char *)bw_GetAttrValue (D, 
 					 B1,
 					 0, 
@@ -905,6 +915,8 @@ void getWavelengthAttr (DATA *D)
 					 "actual_wavelength", 
 					 NULL, 
 					 NULL);
+      }
+
       if (foo != NULL)
 	{
 	  channels[r + 1] = atof (foo);