added template for making views (#377)

Cleaned up the helper functions by: 
- Added template for make_view (and new make_const_view) instead of the
copy paste implementation
- checks c_style and dimensions inside make_view
- test binding to be able to probe the checks in make_view

Call sites can be reviewed in a second PR since usage of const or
strictness of conversion depends...

python/src/module.cpp

@@ -22,6 +22,7 @@
 #include "bind_PixelMap.hpp"
 #include "bind_RawFile.hpp"
 #include "bind_calibration.hpp"
+#include "bind_testing.hpp"
 
 // TODO! migrate the other names
 #include "ctb_raw_file.hpp"
@@ -88,6 +89,7 @@ PYBIND11_MODULE(_aare, m) {
     define_jungfrau_data_file_io_bindings(m);
 
     bind_calibration(m);
+    define_testing_bindings(m);
 
     DEFINE_CLUSTER_BINDINGS(int, 3, 3, uint16_t, i);
     DEFINE_CLUSTER_BINDINGS(double, 3, 3, uint16_t, d);