[fix cabal wrapper to work with cabal-install 1.22.0.0
Helmut Grohne <grohne@cs.uni-bonn.de>**20150105130743
 Ignore-this: 97e2c2bd08aa4f7864c3cbdae46bba9a
] hunk ./igor2 2
-cabal exec dist/build/igor2/igor2 -- "$@"
+cabal exec "$(pwd)/dist/build/igor2/igor2" -- "$@"