Reduce the number of reflows on board updates
Set the board quality to low on origin move
Prevent helper JXG.Coords from emitting events
Merge branch 'master' into ticklabels
Merge branch 'ticklabels'

This introduces some speed improvements to the master branch. These improvements
are achieved by reducing the number of reflows done by the browser by removing
the JSXGraph from the board, then updating the board and then hanging the board div
back into the DOM.

Please note that during some event handlers (e.g. update) the DOM elements that
belong to the board that is updated CAN NOT BE FOUND by document.getElementById().
References to these elements need to be stored before the event handler is called.