APIs missing: remove Flow (prototyping)

[matteogratton]

I don't know if this is something that we should just add to the documentation or if we should implement a function to do it.

in order to remove a flow, we currently have to write:
layer.flow = undefined;
An option could be to have a function that removes it from the selected layer, as well as the function to remove the layer. Something like:
layer.flowRemove();

The way to remove it is missing in the Documentation in any way and I spent time finding it and solved thanks to @lrossi.

[mathieudutour]

or just delete layer.flow I think, which read really nicely