[Patch, fortran] PR14067, PR16943, PR20838 and PR27655 - miscellaneous small fixes

[Paul Thomas]

tobi,

>
> Why not use gfc_notify_std?

Quiet simply not to grace this with the same message twice; it is 
normally an error, except for this one case, where it is standadr 
dependent.  I guess if I make it a char constant, I can branch between 
the two.  Yeh, that's wht I will do.

>
> Otherwise this is of course ok.
>

Thanks

Paul