Performance: Script now allows overrides, for comparison

.gitignore

@@ -18,3 +18,4 @@ CPackConfig.cmake
 CPackSourceConfig.cmake
 patches
 *.exe
+tutorials

performance/run_perf

@@ -13,9 +13,11 @@ else
   cp *.data perf.rc data
 fi
 
-#TASK=/usr/local/bin/tw244
-#TASK=/usr/local/bin/tw250b1
+# Allow override.
+if [[ -z $TASK ]]
+then
   TASK=../src/task
+fi
 
 # Run benchmarks.
 # Note that commands are run twice - warm cache testing.