added tests for underdetermined systems
added tests for underdetermined systems

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