Crates io (#76)

* crates re-organisation

* fixed typo in layout & added test for vmp_apply

* updated dependencies

poulpy-backend/src/cpu_spqlios/mod.rs

@@ -0,0 +1,9 @@
+mod ffi;
+mod fft64;
+mod ntt120;
+
+#[cfg(test)]
+mod test;
+
+pub use fft64::*;
+pub use ntt120::*;