Update netpgp to version 3.99.4/20100601

+ avoid possible free() of new value passed to netpgp_setvar(),
  with thanks to Anon Ymous.
+ netpgpkeys(1):  print keys to stdout, not stderr - reported by Anon
  Ymous.
+ fix DSA signatures and verification
+ simplify and shorten the internals of packet processing by getting rid of
  the intermediate pseudo-abstraction layer, which detracted from understanding
  and had no benefit whatsoever. Rename some enums and some definitions.
+ add some checking to new key generation, and don't try to read in
  the keys after writing them - reported by Tyler Retzlaff
+ netpgpverify - avoid the separate codebase, and just use libnetpgp(3)


(agc)