integrating bug #5227 : During the development of the support of the JCR to store the file metadata, the code for Actify support was accidently removed. Restore this code and adapt it to the new attachment API (support of the JCR).

Conflicts:

	war-core/src/main/java/org/silverpeas/attachment/web/DragAndDrop.java
	web-core/src/main/java/org/silverpeas/attachment/web/SimpleDocumentResource.java