(my) Improvements for multiple Leaflet Markeclusterd maps (fit bounds), interactions from outside of the map & View AJAX calls

Recently I had to implements features that might face multiple Leaflet Markeclusters maps (fit bounds), interactions from outside of the clustered map & View AJAX calls .
I succeeded in all this, as you can see in this project page: http://www.italomairo.com/geoblogcms/en/ip-locations-leaflet
that strongly use the Leaflet and Leaflet markeclusters and IP Geolocation Views & Maps modules.

But for make all this properly working had to hack and fit the leaflet and leaflet markeclusters javascript files.

Here attached is the diff file for the leaflet_markercluster.drupal.js I use now, properly commented in the added/amended code lines.

All this is strictly related to (and fix) other issues like:
#2005334: Interaction with Map and Map Features form outside of the Leaflet Markerclustered map
#2040639: Fit to Features Bounds get Bounds increments of all map's features, when more than one map in the page (Fixed!)
#2038659: Leaflet MarkerCluster ENABLED (!) on all maps if more than one map is shown per page (with IP_Geoloc module)

Last, but not least, this issue is the correspondent of its analogue in the Leaflet Module (#2056551: (my) Improvements for multiple Leaflet maps (fit bounds), interactions from outside of the map & View AJAX calls )