Flag to reload sources unconditionally

[dm3]

This is sometimes useful - e.g. recently ran into something which produced a compilation warning but didn't have any effect on the functionality. Not sure if it's worth including as a core task option, but having something to force reload would be great to have!

[Deraen]

While this is very simple change, I'd rather not merge this unless there are good reason why this is needed.

Often the warnings affect functionality and they should always be fixed.

[dm3]

One such thing is the Javelin cell= macro that deep walks the code and hoists the variables outside of the function. It has some obscure bug that generates warnings when destructuring is used inside the macro. The warnings do not affect functionality in any way.

That's the only case that I'm aware of so far. I find it very annoying if there's no way to make the tools do what you want. I'm OK if there's another way to achieve the same if a task option is too intrusive, e.g. env option?