htmlutils: safer new line handling for FCKeditor
htmlutils: safer new line handling for FCKeditor

* When instantiating a new FCKeditor, remove unicode "line separator",
  "paragraph separator", and "next line" characters from the editor
  default content, so that it does not break the string parameter of a
  JavaScript function.

tiborsimko/invenio,inveniosoftware/invenio,tiborsimko/invenio,inveniosoftware/invenio