Restore IRC capability to master branch.

The browser pane used for IRC chat in-client was accidentally removed in
a merge. I restored the capability via an old commit.
Implemented alternating background color for queue rows. (Issue #22)

Implemented alternating background color for rows in the queue (Issue
#22)
Increased the size of the question number in the queue.
Removed unnecessary arguments in scrollableTextArea.
Changed visual speed round handling, added conflict notification.

Changed the way the header displays speed round status. Instead of
changing the header background color, now only the text of the speed
round button turns red.

When the announced score does not match the calculated score, the
background of the announced score area turns red. This may be changed to
make it more obvious later by changing the whole header and/or add
another visual notification.