Two info fields at left and two at right on gantt chart

[GoogleCodeExporter]

Please add possibility in gantt diagram property show information 
left/right/above/below task more choices: one more at left and one more at 
right.
E.x. Now I use task complete at left and task name at right. But I want to see 
task resource. Resource name at left, and task complete at more left will be 
great.

Original issue reported on code.google.com by [email protected] on 9 Jun 2015 at 6:03