Add a few workarounds to load new RDAs from Vida scanner

[bkossows]

Workaround are quite nasty. I've just wanted to notify the problem.

[coveralls]

Coverage decreased (-0.3%) to 76.62% when pulling b87a225 on bkossows:vida into 0ab76cb on openmrslab:master.

[bennyrowland]

Hi Bartosz,
Thanks for submitting this fix, do you by any chance have an example of the new rda file which could be included as additional test data? Also, could you explain what the SlabOrientation dictionary settings are for, particularly why two of them are commented out?