Add ability to call dynamic update from javascript

[remkonoteboom]

Is your feature request related to a problem? Please describe.
When one part of the interface updates some data, it would be good to be able to call the dynamic refresh explicitly rather that waiting for the interval to update. This will provide a better user experience as the consequences of their actions will be immediately updated through the UI instead of a couple of seconds delay.

Describe the solution you'd like
Currently the dynamic update code is buried within a setInterval. There is a need to be able to call this at will through javascript.

spt.update.run_update()

or something like that.