* added test for log2i() * refactored tests of integer special functions
* added test for log2i()
* refactored tests of integer special functions

hmeine/vigra,psteinb/vigra,timoMa/vigra,timoMa/vigra,timoMa/vigra,mmuellner/vigra,dstoe/vigra,dagophil/vigra,stuarteberg/vigra,funkey/vigra,cbecker/vigra,timoMa/vigra,cha007/vigra,kod3r/vigra,DaveRichmond-/vigra,funkey/vigra,kod3r/vigra,capturePointer/vigra,kod3r/vigra,kod3r/vigra,stuarteberg/vigra,DaveRichmond-/vigra,dagophil/vigra,dagophil/vigra,funkey/vigra,ThomasWalter/vigra,hmeine/vigra,psteinb/vigra,cbecker/vigra,capturePointer/vigra,dstoe/vigra,capturePointer/vigra,xiwei-zhang/vigra,martinsch/vigra,dagophil/vigra,funkey/vigra,cbecker/vigra,dagophil/vigra,capturePointer/vigra,ThomasWalter/vigra,hmeine/vigra,mmuellner/vigra,hmeine/vigra,stuarteberg/vigra,timoMa/vigra,DaveRichmond-/vigra,xiwei-zhang/vigra,capturePointer/vigra,capturePointer/vigra,xiwei-zhang/vigra,stuarteberg/vigra,ThomasWalter/vigra,timoMa/vigra,hmeine/vigra,cha007/vigra,dagophil/vigra,kod3r/vigra,hmeine/vigra,cha007/vigra,martinsch/vigra,stuarteberg/vigra,funkey/vigra,dstoe/vigra,psteinb/vigra,cha007/vigra,stuarteberg/vigra,kod3r/vigra,kod3r/vigra,xiwei-zhang/vigra,xiwei-zhang/vigra,mmuellner/vigra,xiwei-zhang/vigra,martinsch/vigra,stuarteberg/vigra,funkey/vigra,ThomasWalter/vigra,cbecker/vigra,DaveRichmond-/vigra,ThomasWalter/vigra,mmuellner/vigra,martinsch/vigra,DaveRichmond-/vigra,xiwei-zhang/vigra,mmuellner/vigra,martinsch/vigra,DaveRichmond-/vigra,martinsch/vigra,timoMa/vigra,DaveRichmond-/vigra,psteinb/vigra,dstoe/vigra,psteinb/vigra,psteinb/vigra,cha007/vigra,funkey/vigra,dstoe/vigra,cha007/vigra,cbecker/vigra,dstoe/vigra,cbecker/vigra,ThomasWalter/vigra,dstoe/vigra,dagophil/vigra,ThomasWalter/vigra,capturePointer/vigra,psteinb/vigra,hmeine/vigra,mmuellner/vigra,mmuellner/vigra,cha007/vigra