FFTWComplex: added constructor and assignment
FFTWComplex: added constructor and assignment

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