bug #4737 :  Now FileUtil.getMimeType() method uses first the Tika mime-type detector before using the file extension to detect the correct file mime-type
bug #4737 :  Use the Tika meta-type detection based upon both the file content and the file extension instead of only the one based upon the file extension

Conflicts:

	lib-core/src/main/java/com/silverpeas/util/MimeTypes.java