ABSTRACT interfaces + PROCEDURE declarations

[Janus Weil]

Hi,
here comes a new version of my abstract interface patch. I changed one
of the error messages (no more "garbage" ;), made dump-parse-tree.c
(gfc_show_attr) handle abstract interfaces, and implemented the checks
for C1203 and C1236 (I hope my checking is not too naive or
simple-minded). I'll do the check for C1204 in the procedure
declaration patch.
Thanks everyone for your helpful hints. I'm still open for further comments.
Cheers,
Janus
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