HTP and ALO are two settings which you should disable if you are trying to achieve results based on your settings (as opposed to results manipulated by the cameras decision making), if you want your display to show the actual shot you have taken rather than an altered one and if you want to stop your camera from doing pointless work thereby potentially reducing lag.
Tim explains why these settings are not desirable, in particular if you are shooting in RAW, in the following thread:
http://www.talkphotography.co.uk/forums/showpost.php?p=2684230&postcount=385
For the sake of completeness I will point out that a number of people have experimented and found which of these intermediate stop ISO settings are created by software and which are natural ISO settings for the camera. However, it all becomes a bit too much to remember and the reality is you are safe with the full stop ISO settings.
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