eTB Manager

Depends on #128.

This is the evolution of the report tool with the implementation of charts to display the result table.

Initially it's intended to use Highchart Java script lib, but other libraries may be considered, like:

• GWT chart library
• Client side GChart

Others may be considered.

Requirements:

• Users may change the type of charts among bars, pie, area, vertical bars, etc;
• Users may click on a row (or column) of the table and display the selection in the chart;
• Users may be able to compare different columns/rows of the report table in the chart;