added tsScan filter parameter, improved following/follower macros parameter passing.
added tsScan filter parameter, improved following/follower macros parameter passing.

* filter parameter allows user to filter the results on the client if store.filterTiddlers
able to do this. see http://trac.tiddlywiki.org/ticket/1258
* followers and following macros now take same parameters as tsScan.

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