Fix dateline issues for line
Fix bug on getViewportGeoBound

When the ray do not hit a sphere the function consider the point, so the
return geobound is not really valid when the eye is far away from the
globe
Refactor getOverlappedLevelZeroTiles to fix a bug with long lines/polygons

Previous function do not properly take into account all tiles if the
feature is  too long. Use bbox for Geo/MercatorTiling, keep old method
for HealPixTiling
Merge branch 'master' of https://github.com/TPZF/GlobWeb