Indexes with negative natural value are compiled incorrectly

[alexanderzhak]

Instructions with negative natural values are compiled as having positive offset.

For example,

MOVnw       r1, r0(-4,-0)

is compiled into MOVnw r1, r0(+4,+0)

[pbatard]

I'm afraid that, since this is a very old repository of mine and I no longer have any plans for EBC development, I am not planning to invest any more development time on this.

This means that I will not personally fix issues or improve the current code.

If you send Pull Request, I may integrate it into the codebase. But that's about as far as I will go with this codebase at this stage.