Added gregories patch to fitcenter.

Implements a valerr on the peak command

fitcenter.c

@@ -483,6 +483,12 @@ int FitWrapper(SConnection * pCon, SicsInterp * pSics, void *pData,
       SCWrite(pCon, pBueffel, eValue);
       return 1;
     }
+    /* print peak position and its uncertainty */
+    if (strcmp(argv[1], "valerr") == 0) {
+      snprintf(pBueffel, sizeof(pBueffel)-1, "%f,%f", self->fCenter, self->fStddev);
+      SCWrite(pCon, pBueffel, eValue);
+      return 1;
+    }
   }
 
   /* print results */