syms.c (asymbol): Added new field "app_data", for data particular to the

syms.c (asymbol): Added new field "app_data", for data particular to the
application.  Some of the linker flags ought to get moved to this field
someday.

archures.c (bfd_default_scan): Recognize a few more numbers: 80486, 80960,
and 960.

bfd-in.h, bfd.c, targets.c, coffcode.h, coff-mips.c, other targets: Moved COFF
swap table to backend data.

hosts/i386linux.h: Include unistd.h.
aoutx.h, libaout.h, stab-syms.c: stab names are now in constant storage.
trad-core.c: Fixed some `PARAMS' uses that were missing parentheses.
aoutx.h, archive.c, archures.c, coffcode.h, ctor.c, reloc.c, syms.c: Doc fixes.