NetCDF functions

This is the list of all the functions related to NetCDF data.

`abs()`	Compute the absolute value
`acos()`	Compute the arc cosine
`append()`	Append the given data to file
`asin()`	Compute the arc sine
`atan()`	Compute the arc tangent
`atan2()`	Compute the arc tangent of 2 `Fieldset` objects
`attributes()`	Return the attributes of the current `NetCdf` variable
`cos()`	Compute the cosine
`dimension_names()`	Return a list of the `NetCdf`’s dimension names.
`dimensions()`	Return a list of the `NetCdf`’s dimensions.
`div()`	Compute the integer part of a divison
`exp()`	Compute the exponential
`file()`	Return a file handler for the specified filename
`global_attributes()`	Return the `NetCdf` global metadata
`max()`	Maximum
`min()`	Minimum
`mod()`	Compute the integer remainder of a divison
`netcdf_auto_rescale_values_to_fit_packed_type()`	Set the behaviour of `NetCdf` value handling
`netcdf_auto_scale_values()`	Set the behaviour of `NetCdf` value handling
`netcdf_auto_translate_times()`	Set the behaviour of `NetCdf` value handling
`netcdf_preserve_missing_values()`	Set the behaviour of `NetCdf` value handling
`netcdf_visualiser()`	Define visualisation for `NetCdf` data
`read()`	Read the given file and returns a variable of the appropriate type
`setcurrent()`	Set the variable on which `NetCdf` functions will operate
`sgn()`	Compute the sign
`sin()`	Compute the sine
`sqrt()`	Compute the square root
`tan()`	Compute the tangent
`value()`	Return a value from the current `NetCdf` variable
`values()`	Return the values from a data object
`variables()`	Return the names of the variables in a `NetCdf`
`write()`	Writes/appends the given data to file