Fixed side-effect in Model::Manager::_modelHasMultipleInstances()

that tried to load composite as model by mistake, the bug was at least
present sometimes when trying to generate the configuration report

(cherry-picked from d89fe56d09f7dd1d6f375e8290034b752a0f95b5)

Conflicts:
	main/core/ChangeLog
Disable group addon to avoid crash
Set proper resolution to last week period
Merge pull request #594 from Zentyal/ejhernandez/monitor-last-week-3.0

Set proper resolution to last week period
Fixed debian/control depends to ensure proper upgrade to 3.2
releasing ltsp 3.0.3
Fixed in-place boolean edit with non-basic types different to Union
Merge branch '3.0'

Conflicts:
	contrib/asterisk/ChangeLog
	contrib/asterisk/src/EBox/AsteriskLdapUser.pm
	contrib/ltsp/ChangeLog
	contrib/ltsp/debian/precise/changelog
	contrib/ltsp/debian/precise/control
	main/core/ChangeLog
	main/monitor/ChangeLog
	main/monitor/src/EBox/Monitor/Configuration.pm