Diagnostic.c: Add support for %H as location specifier

[Phil Edwards]

Gaby,

> I choosed %H (to mean "here") as opposed to %L (for location) because
> the latter is already taken by the C++ front-end for "the language
> used in a language-specification". 
[...]
> --- 496,503 ----
>      %c: character.
>      %s: string.
>      %%: `%'.
> !    %*.s: a substring the length of which is specified by an integer.
> !    %H: location_t.  */
                       ^
                       |
                       |
Could you put a comment in here like "Chosen to mean 'here'" or some such?
That would be a useful reminder several months from now.


Phil

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