Array changes (CVS commit on moto_opo)

[Stefano Corsi]

- Changed motov_ and motoc_ array_rval to reflect motoi
- Cleaned (unused) multiple index evaluation from moto[iv]_array_rval
- Refactored motoX_array_index back into motoX_array_rval and motoX_array_new
- Created a new motov_arrayIndexCheck(Motoval *) function in motov.c
- Moved isArray(x) check after the evaluation of the index operand (to be able
to check for overloaded operator existance first)
- Removed motoX_array_index from motoX.c

Stefano