import position info from Milsoft

Bugs need to be fixed:
->Add a mouse over event to gridEdit.html
->Add a scale ruler to gridEdit.html such that we know how long it
really takes.
->fix bug of adding house, battery, etc
->remove unlinked nodes
->optimize the position of triplex_node
ATTENTION:
Since lacking info of zone, use relative pixel position instead of real
geo position.
generate coordinates in backend