Table Toggle/Reflow: added rebuild method

@gabrielschulhof, @uGoMobi:

I added the rebuild method to both reflow and columntoggle.

Notes:
- in reflow it doesn't really do anything so we might leave it away, too. Right now it just calls `refresh`
- in colToggle **rebuild**  calls `refresh` and passes `create=false` while in plain **refresh** `create=undefined`
- for both variants, `!create=true`, so both trigger a refresh. 
- inside `addToggles` however, I can now seperate **rebuild** from **refresh** by testing for `!create` (which I named `!keep` ... to make some sense).
- Tests are passing. I will add a test for refreshing a table with new columns, too.