Recursively re compresses directories with lzma2 compression:

• Requires 7zip
• Re compresses Zip, BZip2, and GZip to lzma2
• Files inside of compressed files are also re compressed
• Directories that start with a "." are ignored
• All other files are compressed using lzma2
• After compression, files are broken into 10 MB chunks
• --pack re compresses all files, while --unpack changes all files back to normal