Log Message:
Update to hengband-2.2.1r

The game is supposed to be able to automatically convert old save
files, although the converter may not be fully tested. The list of
changes from 1.6.2 is too long to paste here:

* 1.7.2: https://hengband.osdn.jp/history/history1.7.2.html
* 2.0.0: https://hengband.osdn.jp/history/history2.0.0.html
* 2.1.0: https://hengband.osdn.jp/history/history2.1.0.html
* 2.1.1: https://hengband.osdn.jp/history/history2.1.1.html
* 2.1.2: https://hengband.osdn.jp/history/history2.1.2.html
* 2.1.3: https://hengband.osdn.jp/history/history2.1.3.html
* 2.1.4: https://hengband.osdn.jp/history/history2.1.4.html
* 2.1.5: https://hengband.osdn.jp/history/history2.1.5.html
* 2.2.0: https://hengband.osdn.jp/history/history2.2.0.html
* 2.2.1: https://hengband.osdn.jp/history/history2.2.1.html