shrink historic to ruins and castles
extract feature switching from onEachFeature to new func
feature2popup: fix  return val
Get feature type from featureTypes table
Split featureTypes in two tables: features and types
Merge branch 'RestrictPois'
Use leaflet-ajax external library as git submodule
Load json files directly into js source thanks to metcalf ajax plugin
remove aude contour, unloadable with ajax plugin
fix aude contour

json from http://polygons.openstreetmap.fr/index.py
with id 7446
    (name=Aude
    boundary=administrative
    admin_level=6)
Merge branch 'LoadJson'

load json files directly from js sources,
not imported into index.html as <script>
thank to leaflet-ajax plugin