Log Message:
Update to 2.0.28:

Noteworthy changes in version 2.0.28 (2015-06-02)
-------------------------------------------------

 * agent: Added support for an external password manager.

 * gpg: New command --list-gcrypt-config.

 * gpg: Issue NEWSIG status lines during signature verification.

 * gpgsm: The default hash algo for a CSR is now SHA-256 and the
   default encryption algo is AES-128.

 * scdaemon: Allow PC/SC reader selection by partial name match.

 * gpgtar: Fix extracting files with a size of a multiple of 512.

 * Fixed several other bugs.

 * Libgcrypt 1.5 is now required.