Add clarification about the use of setData to the API documentation

git-svn-id: https://flot.googlecode.com/svn/trunk@60 1e0a6537-2640-0410-bfb7-f154510ff394

API.txt

@@ -523,6 +523,12 @@ members:
     ticks, legend etc. will not be recomputed (use setupGrid() to do
     that). You'll probably want to call draw() afterwards.
 
+    You can use this function to speed up redrawing a plot if you now
+    that the axis won't change. Put in the new data with
+    setData(newdata) and call draw() afterwards, and you're good to
+    go.
+    
+
   - getData()
 
     Returns the data currently used. The data series returned are

TODO

@@ -40,4 +40,4 @@ error margin indicators
 non-xy based graph types
   - figure out how to integrate them with the rest of the plugin
   - pie charts
-  - bar charts with keys instead of x values
+  - bar charts, keys instead of x values