ensure that when we select by line, we include all of the last line, even

ensure that when we select by line, we include all of the last line, even

* src/vte.c: ensure that when we select by line, we include all of the last
	line, even if it's past the edge of the screen.  Snap selection to the
	beginning or end of a line when selecting lines which don't exist.
	Only strip off whitespace if there's nothing but whitespace to the right
	of the selection.  Chuck the non-wrapping selection code.