-  Added text overlay on mouse hover over pins, and render their current value. 
-  Implement double-buffered rendering (all rendering funcs take CDC arg, for portability). 
-  Made file open/save window default to graph directory in resources if no filename is set. 
-  Provided menu options for topmost filter in dropmenu. 
-  Saved and restored window size using GetWndSetting/SetWndSetting. 
-  Set title from file name. 
-  Re-sorted filters for z-ordering. 
-  Changed connection rendering to handle filter z-ordering. 
-  Add visual queue to indicate filter has editable options. 
-  Truncate filter names to remove namespaces. 
-  Show topmost filter in different scheme.