refactoring compress methods in InfdevChunk, decompress methods in MCRegionFile, added extractAllChunks to MCRegionFile, refactored preloading code in MCInfdevOldLevel
refactoring compress methods in InfdevChunk, decompress methods in MCRegionFile, added extractAllChunks to MCRegionFile, refactored preloading code in MCInfdevOldLevel

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