Integrating bugs #5635 & #5743 - Fixing a problem of file upload on Web browsers that are not featured with the JavaScript File API :
- adding a new system in order to decode easily the request parameters and put them automatically into a PoJo
Also :
- fixing upload of a file with some accents in its name)
- fixing attachment creation in multilingual context (it was always created in FR language)
- fixing FileUpload plugin that was not working with security tokens and old web browsers

Conflicts:

	web-core/src/main/java/com/silverpeas/web/RESTWebService.java
	web-core/src/main/java/org/silverpeas/attachment/web/SimpleDocumentResource.java
	web-core/src/main/java/org/silverpeas/servlet/HttpRequest.java
	web-core/src/main/java/org/silverpeas/upload/web/FileUploadResource.java