Fix flicker portal in portal render limit handler
Change:
Extract portal handle process from "handleDataResponse" to "handlePortalData"
Add "action" property to object returned by $.ajax() to identity type of request
Delay low level portal render until no active request of map data.
Code Restructure
Code restructure 2
Code restructure 3
Merge pull request #344 from Xelio/patch-fix-portal-flicker

Fix flicker portal in portal render limit handler