added more tests for MultiArray convolution functions
added more tests for MultiArray convolution functions

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