Split clipboard and X selection

Split clipboard and X selection
	* src/LyXAction.C
	(LyXAction::init): handle new LFUN_CLIPBOARD_PASTE

	* src/insets/insettabular.C
	(InsetTabular::doDispatch): ditto

	* src/insets/insetbox.C
	(InsetBox::doDispatch): ditto

	* src/insets/insetert.C
	(InsetERT::doDispatch): ditto
	(InsetERT::getStatus): ditto

	* src/insets/insetcharstyle.C
	(InsetCharStyle::doDispatch): ditto

	* src/BufferView_pimpl.C
	(BufferView::Pimpl::selectionRequest): stuff selection, not clipboard

	* src/mathed/math_nestinset.C
	(MathNestInset::lfunMousePress): get stuff selection, not clipboard
	(MathNestInset::lfunMouseRelease): clipboard -> selection in
	commented code

	* src/CutAndPaste.C
	(cutSelection): ditto

	* src/frontends/{qt3,gtk}/GuiImplementation.C
	(GuiImplementation::newWorkArea): create new selection, not clipboard,
	since the clipboard is now an object
	(GuiImplementation::destroyWorkArea): destroy selection, not clipboard

	* src/frontends/{qt4,qt3,gtk}/GuiSelection.h: new, copied from
	GuiClipboard.h

	* src/frontends/{qt4,qt3,gtk}/GuiSelection.C: new, copied from
	GuiClipboard.C

	* src/frontends/{qt3,gtk}/GuiImplementation.h
	(selection): new accessor for selection_
	(selection_): new, the global selection object

	* src/frontends/{qt4,qt3,gtk}/Makefile.am: add GuiSelection.C and
	GuiSelection.h

	* src/frontends/{qt4,qt3,gtk}/GuiClipboard.C
	(GuiClipboard::get): return clipboard, not selection
	(GuiClipboard::put): stuff clipboard, not selection

	* src/frontends/{qt4,qt3,gtk}/GuiClipboard.h
	(haveSelection): remove (this is now in GuiSelection)

	* src/frontends/{qt3,gtk}/GuiClipboard.h
	(old_work_area_): remove, since it is not needed anymore

	* src/frontends/gtk/ghelpers.C
	(getGTKStockIcon): handle LFUN_CLIPBOARD_PASTE

	* src/frontends/Clipboard.h
	(haveSelection): remove (this is now in Selection)

	* src/frontends/qt4/GuiImplementation.[Ch]
	(GuiImplementation::selection): new accessor for selection_

	* src/frontends/Gui.h
	(selection): New accessor for the global selection object

	* src/frontends/Selection.h; new, copied from Clipboard.h

	* src/frontends/Makefile.am: add Selection.h

	* src/text3.C
	(various): s/clipboard().haveSelection/selection().haveSelection/

	(LyXText::dispatch): handle LFUN_CLIPBOARD_PASTE
	(LyXText::getStatus): ditto

	* src/lfuns.h: new lfun LFUN_CLIPBOARD_PASTE

	* lib/ui/stdmenus.ui: add new lfun LFUN_CLIPBOARD_PASTE

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@14408 a592a061-630c-0410-9148-cb99ea01b6c8