SConstruct update: * only build python wrapper if SWIG is detected * option to turn of python wrapper build
SConstruct update:
* only build python wrapper if SWIG is detected
* option to turn of python wrapper build

(python wrapper still WIP)

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