GSoC: Statistic Module update

Here is my next status update of the eleventh week of Google Summer of Code 2009:

First of all I finished working on displaying multiple number of visualizations inside one widget. Let us consider the standard 'Students Per Degree' example. Now you create a new widget and change visualization between:
'Students Per Degree (all)',



'Students Per Degree (with projects)':



'Students Per Degree (without projects)':



'Students Per Degree (cumulative)':




The last one represents all three types in a single visualization.

This new option works pretty well on statistic 'visualize' page (you can get there by clicking 'visualize' link on the page which lists all statistics).
It does not perfectly work on the actual statistic dashboard. There is a bug: when you choose a new statistic to be displayed, the visualization does not change. Anyway, when you change a visualization type, a new visualization for the new statistic is displayed. To be fair, I have not found a solution for this issue yet. I tried to debug that JavaScript scripts for a couple of hours and even discovered what was wrong, but could not fix that. I asked Mario for some help and he said he would try to take care of that.

The next thing I did was preparing a new series of patches based on Sverre's suggestions. The patches that were already fine, I already pushed to the main repository.

Then I started to work on access issues. Each statistic should have information about who is allowed to see it. Some statistics should be visible only to program administrators, while some others can be seen also by organization admins. I added a new 'read_access' parameter to the statistic model. Currently frontend may retrieve a complete list of statistics available for the current user by calling /statistic/get_available_statistics request.