Kernel Compression Option

Thanks to the great hard work of @valldrac, an option to compress memory using the zlib library from the kernel has been added.

Compression can significantly reduce the time required to acquire a memory capture. It can achieve the speedup of 4x over uncompressed transfers with a few memory overhead (~ 24 KB).

To enable add "compress=1" to your insmod parameters.
To decompress it you can use pigz or any zlib-compatible library.

See the README for more details.

This release also includes refactoring and cleaning.