Security fixes in Dbase32 1.2

Written for Dbase32 by Jason Gerard DeRose on 2014-08-31

Dbase32 1.2 mitigates the effectiveness of timing attacks against `db32dec()` and `check_db32()`.

These improvements make it much more difficult for an attacker to gain insight into secret data that is either Dbase32 encoding itself or merely interacts with other Dbase32 encoded data. All users are strongly encouraged to upgrade.

For more details, please see:
https://bugs.launchpad.net/dbase32/+bug/1359828

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