Move some Survey Tool code from jsp to java files

We have code in .jsp files that would be easier to work with if it were in ordinary .java files. For example, RefreshRow.jsp is essentially all Java code. Because it's in a .jsp file, however, some standard Eclipse features don't work, such as warnings for unused variables, and the ability to jump to function declarations. The formatting of RefreshRow.jsp (indentation, etc.) is a mess. Code conventions from Oracle recommend "avoid writing Java code ... in your JSP pages". I've tested moving all of the code in RefreshRow.jsp into a new function in SurveyAjax.java, and simply calling that function from RefreshRow.jsp. With that change, the code still appears to run correctly, and numerous warnings are revealed that should be fixed.