Passwall interface improvement (petato).

Patch slightly modified from
http://crawl.develz.org/mantis/view.php?id=106.

    I've made a little patch that improves passwall's
    behavior somewhat. It now gives different messages
    depending on whether you failed the power check,
    there's something blocking your path, or the wall is too
    deep.

    Additionally, the prompts have been removed: if it would
    have been possible to cast the spell without dying,
    that's what happens, and if the wall is too deep it's
    canceled.

    So basically it works like before, except you don't have
    to worry about committing suicide by accident.

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