Grid: update data conversion

we need methods in the StructuredGrid class:

• to_canonical(data): convert grid specific data into a canonical form (xyz order with increasing axes)
• from_canonical(data) convert grid compatible data from their canonical representation to the grid specific form
• compatible_with(other_grid): check if the grid is compatible to another grid
• __eq__: needs to incorporate axes order and whether they are increasing or decreasing

Conversion of data in Inputs:

• along with unit conversion data from compatible grid should be transformed to target grid specification
• grid compatibility should be checked next to unit compatibility

Side-effects:

• NetCDF IO should be streamlined (only select axes order when creating the component)
• Plotting should be streamlined (always plot xyz order with increasing axes)