* Fix in calculation of center. * Changed the radius algorithm.
* Fix in calculation of center.
* Changed the radius algorithm.

Now the calculated center & radius values should correspond to the values found in official NIF files.

niftools/niflib,figment/niflib,BlazesRus/niflib,BlazesRus/niflib,neomonkeus/niflib,neomonkeus/niflib,amorilia/niflib,figment/niflib,neomonkeus/niflib,niftools/niflib,figment/niflib,amorilia/niflib,niftools/niflib