Ignored some tests for Miri

- model jacobian test, because of stacked borrows issue inside ViewStorage (help wanted!?)
- stddev test, as it took too long

nacfahi/src/models/mod.rs

@@ -269,6 +269,7 @@ macro_rules! test_model_derivative {
     ($name:path, $model:expr, [$(($x:expr, $y:expr)),*]) => {
         #[cfg(test)]
         #[test]
+        #[cfg_attr(miri, ignore = "Miri gets angry because of stacked borrows rules somewhere inside nalgebra's storage. The thing is, my own storage implementation IS USED NEARBY (generic_array_storage one), so I AM SCARED PWEASE DOWT HWT MW")]
         #[allow(clippy::too_many_lines, unused_imports)]
         fn model_numeric_test() {
             use ::generic_array_storage::{Conv, GenericMatrixExt, GenericMatrixFromExt};

nacfahi/tests/errors_tests.rs

@@ -6,6 +6,7 @@ use num_traits::FromPrimitive;
 use rand::{thread_rng, Rng};
 
 #[test]
+#[cfg_attr(miri, ignore = "Takes TOO LONG")]
 fn constant_stdev() {
     // some data, x can be whatever
     const SAMPLE_SIZE: usize = 10_000;