Fix thinko: default paste method for plain text

Fix thinko: default paste method for plain text

	* src/lyxtext.h
	* src/text3.C
	(pasteString): Change argument to bool

	* src/text3.C
	(LyXText::dispatch): (LFUN_PASTE): Paste plain text as paragraphs,
	not as lines
	(LyXText::dispatch): Adjust to pasteString change

	* lib/bind/cua.bind:
	* lib/bind/sciword.bind:
	* lib/bind/mac.bind: Move shortcuts from "clipboard-paste paragraph"
	and "primary-selection-paste paragraph" to "primary-selection-paste"
	and "clipboard-paste", since the "paragaph" versions are used in
	LFUN_PASTE and middle-mouse-button paste. Now "primary-selection-paste"
	has the same shortcut it always had, and "clipboard-paste" has the
	shortcut that was originally assigned to
	"primary-selection-paste paragraph".

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@16553 a592a061-630c-0410-9148-cb99ea01b6c8