[patch, fortran, docs] Unformatted sequential and special files

[Thomas Koenig]

Hello world,

the attached patch documents the format for unformatted sequential
files and what is, and is not, supported with special files.

Tested with "make dvi" and "make info".  OK for trunk?

	Thomas

2013-08-30  Thomas Koenig  <tkoenig@gcc.gnu.org>

        PR fortran/30162
        * gfortran.texi:  Document unformatted sequential file format
        and I/O with special files.
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