add list of all csars to gui. #76 #74

 * servlet for handling the request (ListCsarServlet.java)
 * template for showing data (listCsarservlet.ftl)
 * added link to layout.ftl
add comments, #74 #76
Merge pull request #112 from Nik101010/76

add listCsar to gui, fixes #74 fixes #76

* implemented servlet for listCsar
* implemented template for listCsar
* added listCsar to menu