Release v0.0.5

This is mainly a bugfix release with some updates of C interface for relkinema v0.5.5.

Changes:

• FIX: plus/minus after blank turns to unary.
• New stat flag RCS_SRC_SET is cleared/set by set_formula.
• Binary filename changed to fzcalc.bin which is executed via bash script fzcalc.
• BUG: the rational mode is currently broken.
• BUG: .byte mode is broken.
• BUG: .eng mode is broken.
• FIX: 1;2; prints 2
• Some command line options added. Interactive mode will fail to start after reading from stdin.