#59 Make test results page columns customizable

[bonzaib]

In results_page.php, I would like to be able to configure which columns are visible. In particular, I would like to be able to display the priority field for each test, so I can sort by priority and see the order in which I will execute tests.

I did find a "view/hide columns" option for the Priority field on project_manage_page.php but this doesn't appear to affect the test results page.