Complete the prototype removal in ca1431.
The script prevents SWIGTOOL=gdb from working as gdb can't be used to
debug a shell script, it requires a binary.
Add support for SWIGTOOL in all the examples.
SWIG_LIB_DIR and SWIGEXE must now instead be set by all Makefiles.
See issue #473.
-- The commit propagates the package option to the newly create
module node so it is recognized by SWIG
-- Added a relativeimport test for this combination
(in lack of py3 I was not able to test it with py3 but it
"should just work")
