"weekends:false" breaks rendering in ResourceNextWeeksView

[joehoy78]

In the current 1.6.1 flavour version, while "weekends:false" correctly displays the grid by omitting Sat/Sun, the Event Renderer does not handle this. The dateCell function has a "TODO: handle weekends" note, so I presume this is a known issue.

In any case the result is either events displayed incorrectly offset, or halted JavaScript execution if a non-existent column is passed into the HorizontalPositionCache.

I note that the latest code is starting to migrate to a 1.6.4 basis, and I'm happy to assist in the effort.

Good stuff so far otherwise, saved me a ton of time - so thanks!