Regarding ddx operator location in grammar

This was what I was suggesting for the ddx() operator.

Currently it is lumped with the analog_filter_function_call which contains
transition/ddt/idt/slew etc.
The analog filter functions have a lot of restrictions, so in the document we
have all these cases where we apply these restrictions *except* if the filter
function is ddx.

I suggest that we pull ddx() out to its own syntax item:

analog_partial_derivative_function_call ::=
   ddx ( analog_expression , branch_probe_function_call )

and make analog_partial_derivative_function_call part of analog_primary.

Regards
Dave

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