NE: add tests

[ForNeVeR]

Currently, Oddities.NE lacks any unit tests.

We should find some free NE binaries or find a way to generate them, and then add a test suite.

One program I find useful for NE files is called eXeScope. It is able to read the structure of existing files, and I was using it (during the trial period, I think?) to examine the binaries I was working on.

Unfortunately, the program is unfree, and I'm not sure what other tools are available.