speed up generateChunksInLevelIter when chunks is very big. add minRadius and maxRadius parameters; assume server generates at least minRadius and then attempt to copy over maxRadius chunks
speed up generateChunksInLevelIter when chunks is very big. add minRadius and maxRadius parameters; assume server generates at least minRadius and then attempt to copy over maxRadius chunks

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