Make SpecialNewimages.php marginally less horrible. Add spacing, use functions like...

Make SpecialNewimages.php marginally less horrible.  Add spacing, use functions like escapeLike, break comments at 79 columns, don't use C-style comments inline (at least we seem not to usually do that, especially not for one-line comments).  Didn't have the guts to rewrite the whole thing, though.