Metview

-------------------
- added support for numpy 2.0

-------------------
- added helper functions to aid automatic conversion from Macro to Python
- added support for reading PNG files
- added string() function from Metview
- fixed warning message in select() method with pandas 2.2

------------------
- Added arguments() function to mimic the behaviour of the Macro function of the same name
- Fixed case of mean(dim=...) where the input fieldset is not a complete hypercube

------------------
- Fieldset function stdev() now accepts 'dim' argument to compute over given dimension
- added new function plot_xs_avg() to provide high-level plotting interface for average cross sections
- Fixed issue where functions that take numpy arrays as input did not work properly with multi-dimensional arrays

------------------
- fixed memory leaks when passing strings, numbers and dates from the binary layer to the Python layer

------------------
- Fieldset functions mean() and sum() now accept 'dim' argument to compute over given dimension
- function gallery.load_dataset() now downloads from a new server
- added new functions smooth_n_point() and smooth_gaussian() to perform spatial smoothing on fieldsets with lat-lon grids
- added new function convolve() to perform spatial 2D convolution on fieldsets with lat-lon grids