o Do per-record locking instead of whole file locking

o Use said locking to prevent a partial guess race as required by
  RFC 2289.  We now lock the record in skeylookup(), skeygetnext(),
  and skeyverify().
o A little KNF
o Kill deprecated getskeyprompt() function
o Provide a function to unlock a record, skey_unlock()
o Timeout reading of the passphrase in skey_authenticate() and
  skey_passcheck() since we have the record locked (uses select, not alarm).
o Convert old-style md4 entries (that lack an explicit hash) into
  new-style ones with the hash specified if there is space on the line.

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