Add unit tests for the helper scripts

[StuntsPT]

pyRona now has a helper script to convert from GESTE to LFMM, which should also be tested.

[StuntsPT]

@Lonewolfenrir Do you want to tackle this? Or are you currently busy with other stuff?

[LoboGalhardo]

I can, but only in February.

[StuntsPT]

It's a deal, then. There will probably be two scripts by then, though. =-)

[StuntsPT]

Giving the issue a low priority, since the gest2lfmm.py script is no longer necessary, as file conversion can be performed by LFMM itself.