Further revision of the raise/lower selection to super/subscript

	Further revision of the raise/lower selection to super/subscript
	patch, avoiding class data member for nestinset

	* cursor.h: remove paste() (was forgotten)
	* mathed/math_nestinset.C
	(MathNestInset::doDispatch):
	(MathNestInset::lfunMouseRelease):
	(MathNestInset::interpret): incorporate saved selection into
	script() call parameters
	(MathNestInset::script): saved selection is extra parameter
	* mathed/math_nestinset.h: extra parameter; remove safe_

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@13431 a592a061-630c-0410-9148-cb99ea01b6c8