added docstrings and comments to presentChunks, allChunks, and getChunk
added docstrings and comments to presentChunks, allChunks, and getChunk

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