1. Add new "Users" table login date and PGP key columns:

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ALTER TABLE Users ADD COLUMN LastLogin BIGINT NOT NULL DEFAULT 0;
ALTER TABLE Users ADD COLUMN PGPKey VARCHAR(40) NULL DEFAULT NULL;
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2. Merge "web/lib/config.inc.php.proto" with "web/lib/config.inc.php".

3. Enable the PDO MySQL extension (pdo_mysql.so) in "php.ini".

4. Upgrade to PHP>=5.4.0 or enable "short_open_tag" in "php.ini".

5. Install translations by running `make install` in "po/".
