* Run w32-dll/build-def when we introduce a new fucntion.

* switching from encrypt to decrypt requires a close and open.
  Wouldn't it be better if we have a reset function or integrate that
  with setkey?

* add more tests.  Even basic is very minimal.

* udiv-qrnbd.o should get build as *.lo [HPUX]

* Allow operation using RSA keys consisting of the OpenSSL list of
  parameters and allow for a third form where the private Exponent
  is not given (saves space).

* Add a warning to the manual, to check that libgcrypt actually has
  been compiled with thread support when used by a threaded
  application.

* write an autoconf test to check whether the linker supports a
  version script.

* Make use of the forthcoming visibility attribute.

* Add attributes to the MPI functions.