[all] FIX the packaging system. #47
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The initial problem is that the SP3_add_python_package (and few others) was using
configure_file() to install python package into the build dir (as well as install dir).
The problem is that configure_file, because of the variable expansion, create a link
between the file and CMake...so each time the file is touched, cmake is re-executed.
To me it make no sense to use configure for every .py unless you really want variable expansion (and thus have an
explicit filename.py.in) for that.
So I refactor the whole thing to:
(so we can now edit python bug without noticing too late that we touched the files in build directory).