Snippets sets

The snippets sets are renamed with more explicit names. set1 is renamed into setAjax. set2 and set3 are merged and becomes setBasic. A new set, setXul, for output map DUA_XUL is added.

These changes imply some migrations for your customized snippets.

setAjax (formely known as set1)
Adapt main.xhtml to reflect the last enhancement on resource deployment.
setBasic (formely known as set2 and set3)
As setBasic is the result of the merging of set2 and set3, it is recommended that you rework your customization from this new set.