made generic concertina plugin for interacting with a tiddler concertina
made generic concertina plugin for interacting with a tiddler concertina

this will make plugins that using the concertina (currently following and TiddlerIcons
smaller and less complex).
This will allow other plugin developers to make use of the concertina.

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