The nicefrac patch

	The nicefrac patch

	* LaTeXFeatures.C
	(simplefeatures[]: add nicefrac

	* mathed/math_factory.C
	(createMathInset): change frac semantics

	* mathed/math_fracinset.[Ch]

	(MathFracInset::metrics):
	(MathFracInset::draw):
	(MathFracInset::drawT):
	(MathFracInset::write):
	(MathFracInset::mathmlize): add nicefrac stuff

	* mathed/math_dfracinset.C:
	* mathed/math_tfracinset.C: adapt semantics

	* frontends/qt2/ui/QMathDialogBase.ui

	* frontends/qt2/QMathDialog.[Ch]
	(QMathDialog::symbol_clicked): provide GUI

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@13566 a592a061-630c-0410-9148-cb99ea01b6c8