PY23: integrate: print -> print_
PY23: interpolate/rbf: fix function code handling + callable()
PY23: interpolate: remove unnecessary list()'s + minor cleanup
PY23: io: remove unnecessary list()'s
PY23: io/arff: import next() on Py2
PY23: io: fix string handling + add some missing imports + fix int type handling
PY23: lib: port decorator.py
PY23: linalg: callable()
PY23: linalg: print -> print_
PY23: linalg: remove unnecessary list()'s + minor fixes
PY23: misc: remove unnecessary list()'s
PY23: ndimage: fix type handling
PY23: ndimage: remove unnecessary list()'s + minor fixes
PY23: odr: print -> print_ + remove unnecessary list()'s
PY23: optimize: callable() + exec + builtins
PY23: optimize: remove unnecessary list()'s
PY23: optimize: print -> print_
PY23: signal: callable() + remove unnecessary list()'s
PY23: linalg: print -> print_
PY23: sparse.linalg: iteritems + remove unnecessary list()'s + other fixes