Enable user to click (and have function) "Compute from SRS bounds" #87
Description
Currently when editing a layer that you intend to use for a MapML preview, you need to set the SRS to a MapML:name. However, for remote layers where the bounds are established via markup transmitted from the remote capabilites document, the bounds may not be suitable for the actual data being served. This either requires manual bounds calculation or some other solution. It would be convenient to enable the (native) bounds calculation from the SRS bounds in use. This would be an appropriate default value in many cases. However, this function does nothing when clicked when a MapML: srs is selected; you need to select the underlying EPSG: srs and do the same click in which case it appears to work. It would be good to not have to do that extra step, fwiw.
