New Feature: (method 2)Remove lower level portal when portal render limit reached

https://github.com/breunigs/ingress-intel-total-conversion/pull/302

Run time is 2/3 to 1/2 of previous method. 

Bug: If ```minLevel``` set in previous ```handleDataResponse```, and data in current ```handleDataResponse``` do not have portal lower than ```minLevel```, ```renderUpdateStatus``` will show a wrong "only loading portals with level x and up".