See also: https://github.com/vasi/pixz/issues

CLEANUP
	* massive cleanup
		* error handling
		* signal handling
		* globals
	* autoconf
	* optimized settings
		* memory limit
		* cpu number
		* block size, for max threads on small files

BUGS
	* performance lags under IO?
	* slow input -> CPUs idle while waiting for input
	* safe extraction
		* abort if block size exceeded

EFFICIENCY
	* more efficient indexing: ranges? sorted? mtree?
	* circular buffer > linked list?

DOCUMENTATION
	* man pages
	* command help

FEATURES
	* support multiple streams
		* tarball append without decompression
	* other archive formats: cpio?
	* lzma-like API
	* recovery tool (already is, kinda)