ds: remove fields.pm usage

Since the removal of pseudo-hash support in Perl 5.10, the
"fields" module no longer provides the space or speed benefits
it did in 5.8.  It also does not allow for compile-time checks,
only run-time checks.

To me, the extra developer overhead in maintaining "use fields"
args has become a hassle.  None of our non-DS-related code uses
fields.pm, nor do any of our current dependencies.  In fact,
Danga::Socket (which DS was originally forked from) and its
subclasses are the only fields.pm users I've ever encountered in
the wild.  Removing fields may make our code more approachable
to other Perl hackers.

So stop using fields.pm and locked hashes, but continue to
document what fields do for non-trivial classes.

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