Add description and image for ST_LocateAlong
Update description and add images for ST_LocateAlong
Add image for ST_LocateAlong
Update description ST_LocateAlong
Update images fot ST_LocateAlong
Update images with square root for ST_LocateAlong
Merge remote-tracking branch 'mireille/st_locatealong' into gh-pages
Corrections for @mlecoeuvre