CLEANUP
	* massive cleanup
		* error handling
		* signal handling
		* globals
	* non-tar parallel compression
	* multi-threaded decoding
	* command-line options
	* autoconf
	* portability: byte-swapping
	* optimized settings
		* memory limit
		* cpu number
		* block size, for max CPU usage

BUGS
	* fast input or slow output -> blocks pile up, huge memory usage
		* performance lags under IO?
	* slow input -> CPUs idle while waiting for input

EFFICIENCY
	* should use ordered list in collator
	* more efficient indexing: ranges? sorted? mtree?
	* command-line options

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)