src/PythonModule.cpp gets bulky

[Christophe Delaere]

Probably the simplest thing to do is to just call functions from a
central module definition. e.g.

//file 1
BOOST_PYTHON_MODULE(poc)
{
wrapFoo();
wrapBar();
wrapBaz();
}

//file 2
void wrapFoo() {
class_<...>(...);
}

//file 3
void wrapBar() {
class_<...>(...);
}

//file 4
void wrapBaz() {
class_<...>(...);
}