Fixed dialog scrollbar being hidden on Chrome-OSX

See issue #5
Fixed SVGPan being active when a modal was open

Whenever the modal dialog was displayed, scolling with the mousewheel
would still scroll the starmap around. This has now been fixed by
explicitly applying the SVGPan event listeners to the SVG DOM element
rather than the entire window..
Fixed starmap sphere selection for SC2-starmap

Whenever you would select the 2155AD spheres for the SC2 starmap, and
would then want to view the 2134AD spheres again, StarmapJS would
erroneously tell you that that sphere selection isn't available for the
Project 6014 starmap, even though you weren't viewing the p6014 starmap
to begin with..
Version increment