Armatures with > 100 bones can deliver a 'parent IK menu' that doesn't
fit on screen anymore. Fixed it with changes;
- when menu doesnt fit to right/left, it places it aligned to left hand
of window
- when more than 8 collums in a menu exist, it makes collums 25 items
instead of 20.
Also fixed for the popup menu on Bone parenting. On a 1280 screen we now
can have a menu with over 300 bones (even more when you zoom down the
buttons window a bit). Still not optimal, but at least it's less annoying.
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