Expose argument names to Python bindings

[dbaston]

Feature description

Most Python functions currently have a signature (*args,**kwargs). This is a result of the SWIG feature compactdefaultargs, which is both turned on globally in several .i files using %feature("compactdefaultargs"), and turned on automatically by SWIG whenever %feature("kwargs") is used (some 400 instances). Many invocations of %feature("kwargs") are enabled only for certain languages, for reasons that are not always clear.

Full signatures (such as def OpenEx(utf8_path, nOpenFlags=0, allowed_drivers=None, open_options=None, sibling_files=None)) can be obtained by disabling compactdefaultargs using %feature("compactdefaultargs", "") and re-enabling it only for the handful of functions that require it for overload resolution. (SWIG warnings indicate which functions are affected.)

Additional context

No response

[geographika]

An advantage of having the parameter names available in the Python bindings will be that IDEs will be able to show the parameters interactively, as the IDLE example below.