Add comment.
Add convenience method.
Use hide_cursor() instead of click on start button + ESC hack.

In the winxp feature, the "clicking on the start button" approach
leaves the cursor on the start button, blocking its view so that it
breaks the "The panel menu should look like Microsoft Windows XP's
start menu" scenario.
Merge three steps together and reorder them.

We merge "Tor has built a circuit", "the time has synced" and "Tor is ready"
into a single step called "Tor is ready". This simplifies scenarios quite a bit,
and allows us to always do the checks in the right order, without each scenario
trying its own version.

Speaking of the right order: we wait for the "Tor is ready" notification first.
it disappears after a timeout, so if we wait for other events first, we
sometimes cannot find the notification picture on screen later on.
Adapt the test suite documentation to recent changes.
Get rid of the "I have a network connection" step: "Tor is ready" covers it.
Expand starting the browser: else, sometimes it's not focused after the snapshot is restored.

Besides, starting the browser one more time is not so costly.
Revert "Press ESC before opening the GNOME run dialog."

This reverts commit 34c23e51ffd95d237c7e21c5c6e56bec51832129,
which is useless now that 31b8743 was essentially reverted.