added createChunks and rewrote createChunksInBox
added createChunks and rewrote createChunksInBox

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