Updated WTemplate
Theme can be defined from the view and model in headers

- View::setTheme is now working
- Added some checkings in admin theme
- Clean header treatment
Issue on Doc of WDate
Added a checking on headers in WResponse
Added a missing parenthesis
Update WTemplate with unregisterCompiler
Mail app structure added
Update WT with parseString
WRetriever is now working with variables in the querystring
Updates WTemplate
UserApp: doc cleansing and a few optimization
fMailbox helper added to retrieve POP3/IMAP mails
UserApp: some more doc improvement
Manifest parsing used to ignore simple node <action>test</action>
UserApp: simplified user deletion
UserApp: Fixes a bug on pagination
Notes are saved when a header location is preempting the view
News are sorted by date DESC by default in admin
Do not overwrite page's title if already assigned
Implementing mail send