Fixed bugs:

• Issue #198: SRFI 46 ellipsis renaming not supported on R7RS REPL
• Issue #199: Incorrect result in gcd procedure
• (sagittarius ffi) created invalid string when returning value char* contains negative value.
• macroexpand-n expended n+1 times.

New features:

• SRFI-139, compile-r7rs has been supported on POSIX environment.
• SXML to object builder (text sxml object-builder) has been added (not documented yet).
• Simple RSS 2.0 library (net rss) has been added (not documented yet).
• (text sql) now supports LIMIT and OFFSET non standard SQL clauses.