updated spaceLink to be floorboard bag aware
updated spaceLink to be floorboard bag aware

these changes check whether a bag is a floorboard bag rather than
a space and if so does the right thing to allow users to import the
tiddler into their space / create the right link

FND/tiddlyspace,FND/tiddlyspace,TiddlySpace/tiddlyspace,FND/tiddlyspace,TiddlySpace/tiddlyspace,TiddlySpace/tiddlyspace