All: Fix devices that attach files and have special meaning for -A switch

The -A attach time switch implicitly means to open files in append
mode.

Some devices used -A to indicate ASCII data or AUTOSIZE of disk or
fixed size tapes - DECtape.  These devices are either read only devices
(Paper tape readers or card readers), so explicit forcing of the attach
to be -R avoids unexpected positioning errors.  The random access
Disk and fixed sized tapes buffer the container contents in memory
so append mode isn't relevant, but care must be taken to assure that
the buffer reading starts at the beginning of the file without regard
to the explicit open mode.

As reported in #821

PDP11/pdp11_tc.c

@@ -1299,6 +1299,7 @@ else if (uptr->flags & UNIT_11FMT)
     sim_printf ("16b format");
 else sim_printf ("18b/36b format");
 sim_printf (", buffering file in memory\n");
+(void)sim_fseek (uptr->fileref, 0, SEEK_SET);           /* start at the beginning of file */
 uptr->io_flush = dt_flush;
 if (uptr->flags & UNIT_8FMT) {                          /* 12b? */
     for (ba = 0; ba < uptr->capac; ) {                  /* loop thru file */