Package our functional UI test suite as an XWiki Extension for community-sourcing of our compatibility grid

The idea is the following:

• Allow end users to install the extension and run the tests on their current XWiki Enterprise instance
• At the end of the test make the extension publish the result by POSTing the result to a xwiki.org URL. The results should include:
  • XE version
  • DB version
  • DB driver version
  • Browser version
  • Console logs
  • Screenshots taken
• Display test results on several places of xwiki.org:
  • On a general compatibility page
  • On the Installation page for specific Servlet Containers and Databases

Note that we need to improve a bit the test suite so that:

• All tests create data in a Test space
• If a test requires a default page of XE we need to verify it contains what we need before the test starts and if not then mark the test as skipped instead of failing it
• Tests work independently of what data already exists in the wiki