extractHeights now returns a uint16 type array to avoid overflow problems
extractHeights now returns a uint16 type array to avoid overflow problems

arruda/pymclevel,mcedit/pymclevel,ahh2131/mchisel,ahh2131/mchisel,codewarrior0/pymclevel,mcedit/pymclevel,codewarrior0/pymclevel,arruda/pymclevel