code: protected String getContent(String fileName, MessageMgr mm){
  		StringFileLoader sfl = new StringFileLoader(fileName);
  		if(sfl.getLoadErrors().hasErrors()){
  			mm.report(sfl.getLoadErrors());
  			return null;
  		}
  
  		String content = sfl.load();
  		if(sfl.getLoadErrors().hasErrors()){
  			mm.report(sfl.getLoadErrors());
  			return null;
  		}
  		if(content==null){
  			mm.report(MessageMgr.createErrorMessage("run: unexpected problem with run script, content was null"));
  			return null;
  		}
  		return content;
  	}
docs: Returns the content of a string read from a file.
  @param fileName name of file to read from
  @param mm the message manager to use for reporting errors, warnings, and infos
  @return null if no content could be found (error), content in string otherwise