improve config documentation
reorder config
refactor init_map()
refactor open_infopage()
refactor init_dialog_window()
show_filesize(): optional time and size properties
plot default box
refactor extract_init_pro()
disable startDrag(), no longer can draw a box by hand
refactor polygon function calls
show/hide menu for box correctly
indent
refactor plot_default_box_reset()
refactor plot_default_box_menu_off()
larger default box
function typo
refactor move_map_to_city()
run polygon_init() only once, otherwise we will get strange results
cleanup
refactor javascript float coordinates