Update to 2.0.20:

Noteworthy changes in version 2.0.20 (2013-05-10)
-------------------------------------------------

* Decryption using smartcards keys > 3072 bit does now work.

* New meta option ignore-invalid-option to allow using the same
  option file by other GnuPG versions.

* gpg: The hash algorithm is now printed for sig records in key listings.

* gpg: Skip invalid keyblock packets during import to avoid a DoS.

* gpg: Correctly handle ports from DNS SRV records.

* keyserver: Improve use of SRV records

* gpg-agent: Avoid tty corruption when killing pinentry.

* scdaemon: Improve detection of card insertion and removal.

* scdaemon: Rename option --disable-keypad to --disable-pinpad.

* scdaemon: Better support for CCID readers.  Now, the internal CCID
  driver supports readers without the auto configuration feature.

* scdaemon: Add pinpad input for PC/SC, if your reader has pinpad and
  it supports variable length PIN input, and you specify
  --enable-pinpad-varlen option.

* scdaemon: New option --enable-pinpad-varlen.

* scdaemon: Install into libexecdir to avoid accidental execution
  from the command line.

* Support building using w64-mingw32.

* Assorted bug fixes.

(wiz)