Issue #4: x86_decoder: Recognize hlt instruction
opdis_term: Fix memory leak of opdis_insn_buf
disasm_linear: Free instruction after display
model: Really free the op in opdis_op_free()
model: Free prefixes, comment and operands in opdis_insn_free()
model: Correct use of alloc_operands in opdis_insn_alloc_fixed (memleak)
OPDIS : Minor version bump.