Fix #81: could not get paragraphs in Markdown due to the interaction between smiley and Markdown. Refactored the smilify code to use a series of regular expressions over the text when working with markdown.

#downloads-search {
   text-align: center;
}
#downloads-add td {
    padding-bottom: 5px;
}

#downloads-add fieldset {
    margin: 1em 0 1em;
    padding: 0.5em;
}