Can re-submit create requests during processing of site save

The process for saving sites can take a while and there is currently no 
indicator to show that the system is processing the request. It is therefore 
very easy for second and third requests to be made during the processing which 
create copies of the site being saved. 

In concert with issue 5?? this creates confusion and potential issues in the 
data.

Need to subsequent submit actions whilst a site is being saved and also display 
a processing indicator while the process is running.

Original issue reported on code.google.com by CoolDa...@gmail.com on 17 Jan 2014 at 6:23

bsed / ala

Can re-submit create requests during processing of site save #532