added ne, te and nete including fit with edge value, minimum value and mask...

added ne, te and nete including fit with edge value, minimum value and mask options, latter required since chain2 does not do it

git-svn-id: https://spcsvn.epfl.ch/repos/TCV/gdat/trunk@7820 d63d8f72-b253-0410-a779-e742ad2e26cf