HTML Cleanup from C.L.

HTML Cleanup from C.L.

changes:
- removed
  /errors/danish/ERR_CLIENT_ABORT and
  /errors/finnish/ERR_CLIENT_ABORT, the files
  are not used anymore
  (set the -E flag to remove the empty files)
- replaced
  <!--BODY{background-color:#ffffff; font-family:verdana,sans-serif}-->
  by
  <!--BODY{background-color:#ffffff;font-family:verdana,sans-serif}PRE{font-family:sans-serif}-->
  since the BODY font style did not affect fontstyle in <PRE> parts
  of the HTML documents.
  affected files:
  all ERR documents (27 languages * 29 files per lang = 783 entries),
  cachemgr.c (3 entries), ftp.c, gopher.c, urn.c (1 entry each)
- corrupt HTML code fixed:
  /errors/serbian/ERR_CANNOT_FORWARD contained a duplicate english
  part
- corrupt HTML code fixed:
  many ERR documents contained either whitespace at the beginning
  of the <TITLE> string or at its end.
  (don't set the -l flag when patching)