do not display ref_points and panorama further than 25km from the current one (tunable in constant)

Use propper RefPoint::get_all() instead of requiring ref_points.local.php

moved the ref_points path to a constant.

some request input checking/sanitization

The one-step upload now handles as well the tiles generation and stops on generation errors if needed

fixes bug : image_loop not returned properly after being parsed from file

tolerate that the dir exists before tiles creation

Moved error handling and autoloading outside of the utils::init() (__autoload was not working actuallly)

allow upload with same names

added params generation to upload