Webtest fixes for Configure Events UI changes

Many of the Event webtests are broken due to changes in the Manage Events UI (and some general UI changes, and some Selenium changes).

• Notifications need to be updated. For example, in WebTest_Event_AddEventTest::_testAddLocation()
  $this->waitForTextPresent("'Location' information has been saved.");
  Needs to be replace with:
  $this->waitForText('crm-notification-container', "'Location' information has been saved.");

Not sure how many instances throughout the test suite (some have already been fixed). Maybe grep for 'has been saved' :-0

• $this->check("some-id") no longer works for checkboxes that trigger a jQuery action (e.g. show a hidden div). We need to use $this->click("some-id")

Committing some partial fixes and will create a wiki page to track this tomorrow.