Fix fluid.learn abstraction not displaying properly (flucoma#101)

* initial cleanup

* changes to chroma help file

* add a deferlow to fluid.learn

* provide a small musical example on first tab

* add chroma frequency calculation

* replace list.change with zl.change

* make a soundful demonstration on each tab

* fix incorrect refrences to previous help files

* update positioning of online reference/flucoma link

* update fluid.learn patch to render more reliably