Despite myLayouts currently being more popular in examples, make
them all myLayout as in man/xmonad.hs to avoid mixing them in the
same module as was done a few places, leading to confusion for some users.
issue 105 was due to the fact that tab windows created when
bootstrapping the windowset after a restart where managed. Setting the
override_redirect attributes to True fixes the issue.
Added the possibility to set the override_redirect attribute with
XMonad.Util.XUtils.creationNewWindow