Edit WebSubmit Function

This function sends an email to the referee of a document informing
him/her that a request for its approval has been submitted by the
user.

@param categ_file_appreq: (string) - some document types are
      separated into different categories, each of which has its own
      referee(s).
      In such document types, it's necessary to know the document-
      type's category in order to choose the referee.
      This parameter provides a means by which the category information
      can be extracted from a file in the current submission's working
      directory. It should therefore be a filename.

@param categ_rnseek_appreq: (string) - some document types are
      separated into different categories, each of which has its own
      referee(s).
      In such document types, it's necessary to know the document-
      type's category in order to choose the referee.
      This parameter provides a means by which the category information
      can be extracted from the document's reference number.
      It is infact a string that will be compiled into a regexp and
      an attempt will be made to match it agains the document's reference
      number starting from the left-most position.
      The only pre-requisite is that the segment in which the category is
      sought should be indicated with .
      Thus, an example might be as follows:
         ATL(-COM)?--.+

      This would allow "PHYS" in the following reference number to be
      recognised as the category:
         ATL-COM-PHYS-2008-001

@param edsrn: (string) - the name of the field in which the report
      number should be placed when the referee visits the form for making
      a decision.

@return: (string) - empty string.