have fixes on Tracker SOAP API

use id for ugroups instead of name (none is now 100)

new behaviour in users binding

new behaviour in all list (id instead of label in soap)

do some refactoring + fix bugs

get tracker field exports user id

refactor wsdl

refactor tests

Add entry in the changelog

change version + changelog of tracker soap api

Change-Id: Id043f2e680a61b6b08577353899f0d648b5f70ea
Merge commit 'refs/changes/79/279/4' of http://gerrit.tuleap.net/tuleap into tuleap-stable-master

* http://gerrit.tuleap.net/tuleap:
  have fixes on Tracker SOAP API

Conflicts:
	plugins/tracker/ChangeLog
Tuleap 5.11.99.1