added test cases to test in-placeness of convolutionMultiArray and for the gradient-generating functions
added test cases to test in-placeness of convolutionMultiArray and for the gradient-generating functions

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