* imported X.org's GTF function, and use it to compute modes that are not on
the list.
* Also, accept a 6% variation for the selected mode refresh rate.
* Automatic whitespace cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31654 a95241bf-73f2-0310-859d-f6bbb57e9c96