New postbbcode version

This is only a quick hack of bbcode and smiley support for postnuke modules.
=> should be part of the cms (general abbrevation text=>text or text=>images)

supported bbcode (defined in bbcodes.php):
[b] = bold
[i] = italic
[u] = underlined
[h1] = header 1
[h2] = header 2
[h3] = header 3
[h4] = header 4
[ot] = off topic (text will be grayed)
[img src=imagelocation align=left] = include image
[url] = http url
[email] = mail url
[color=] = color text
[list] = list
[*] = listitem
[code] = marks preformated text (pre)
[quote]
[small] = use small font
[big] = oposite of small
[box] = draw bordered box

known smileys:
:-) :)
:-( :(
;-) ;)
:-O :O
:-)) :)) :-D :D
8-) 8)

each image in the "postbbcode/images/smilies" directory can be included
[pic:<name_of_image>]

[pic:exclamation] => shows postbbcode/images/smilies/exclamation.gif