split iothrottle form

//fixme : enable/disable splitbutton

Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
use separate button for disk throttle.

There is enough space in the toolbar, so this is good enought for now.
Also remove some dead code, and re-ordered HDEdit to use both columns, which
looks better inside the CreateWizard.
update max cores limit to 128
bump version to 3.1-35
make lint happy