Remove broken touchBoundaryFrame fix

This fix was added pre SC 1.9, and while it made the button clickable,
it also removed the touchBoundary slop that had been built into the
view.

A better fix for the bug was introduced in SC 1.9

http://blog.sproutcore.com/announcing-sproutcore-1-9/

This fix keeps the touchBoundary slop, which allows a user to slightly
drag their finger off the button without causing a touchCancel.

(Note, this touch boundary does not actually affect the initial hit area.)
Widen touchBoundary on Submit and Next buttons

This touchBoundary allows the user's finger to slip off the button
slightly without causing a touchCancel event. Note that it does not
affect the initial hit target.

The touchBoundary now works again on the Submit button after ea8209b91

This widens the touchBoundary from the default of 25px to 50px.
Add option to user larger Next and Submit

This option, window.showLargeButtons, will make the Next and Submit
buttons use SC.HUGE_CONTROL_SIZE, with its associated height of 30
pixels.

This does not require any other changes to the layout, as the bottom
toolbar is 33 pixels high, and isn't affected by the larger button.