fixed bug "duplicated end point"
factorised some functions

DPCase.closePolygon, LectureFichier.completeAndInsert
factorised some fcts & started insertAsPolygon
completed insertAsPolygon

not tested yet
fixed bug: angle incrementation
fixed bug: Vdir is reset to + for each zone
fixed bug: radius formula
added interpolation for DACase
fixed bug: radius unit (degrees vs radians)
circles in mongodb geo data format

& same key "Geometry" for full circles and polygons