Use a faster version of infinite-to-infinite block copy when the regions are both chunk aligned.
Use a faster version of infinite-to-infinite block copy when the regions are both chunk aligned.

Copy the block data and lighting, then relight only the chunks at the edges.

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