fixes first open bug but causes crashes
keep track of previous standin marker object so one does not need to re-initialise the list content
Merge branch 'master' into clustered-marker-tweaks
re-initialising the list object as lazy workaround for blank list
Merge branch 'master' into clustered-marker-tweaks

Conflicts:
	src/mapapi.ui.js
adding 1000 markers at a time, exposing the function for adding markers to the browser console