synchronize pages in files when saving

We want to add a listener to xwiki page changes on current.dev so that when an xwiki page is changed:

• if the page is part of the application code pages, it is saved in XML in wiki/src/main/resources
• if the page is part of the application editorial pages, it is saved in XML editorial/src/main/pages
• if the page is also part of the application source code pages, it is also saved in source form in wiki/src/main/page
• if the page is also part of the application editorial code pages, it is also saved in source form in wiki/src/main/page

The save could be complemented with an svn commit using the comment of the page save. This would enable tracking pages to be ported (currently maintained in Admin/ChangedPages) to be jira visible. It would also enable a slightly safer versioning.