Original TODOs done

This code shows just simple crud, following the example of Getting Started tutorials. It can be used as a starting point for developing a more sophisticated example showing real professional techniques. There may be some other approaches for CRUD: recommended ones should be explained. 

Some ideas for subtasking in JIRA [1]:

 * SUBTASK Fully i18e application: database text data; static text in jsp; validation.xml; links for locales.
 * SUBTASK Definitely, improve 'country' implementation
 * SUBTASK add jetty and tomcat plugins to pom.xml
 * SUBTASK look & feel like that of showcase applications; enhance visualization (style, css)
 * SUBTASK spring, db, orm, modeldriven, abstract crud action
 * SUBTASK upgrade logging to sl4j?
 * SUBTASK comment important code
 * SUBTASK implement preprareInput case, and explain usage of basicStack, defaultStack, pppStack
 * SUBTASK readonly screen (view mode)
 * SUBTASK 1 to n relationship

[1] https://issues.apache.org/jira/browse/WW-3993