Bumped version to 0.2.1.
Added functions MAKE-PID, MAKE-PORT, and MAKE-REFERENCE.
Added Optima patterns for pattern-matching on tuples and Erlang strings (integer lists).
Renamed STRING-TO-BYTES to STRING-TO-BYTE-VECTOR.
Added new function ETF-BOPS:STRING-TO-BYTE-LIST.
Added Optima pattern for pattern-matching on Erlang binaries.