A more general way of setting paragraphs in an inset to standard

	A more general way of setting paragraphs in an inset to standard
	layout upon paste.

	* insettext.[Ch]: add forceParagraphsToDefault method

	* insettabular.C
	(InsetTabular::doDispatch): use it for cell

	* insetbox.C
	(InsetBox::doDispatch): use it

	* insetert.C
	(InsetERT::doDispatch): use it

	* insetcharstyle.C
	(InsetCharStyle::doDispatch): use it

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@13535 a592a061-630c-0410-9148-cb99ea01b6c8