[xwiki-devs] Choosing a JIRA issue ...

Hi Devs, I've gone through xwiki-core JIRA list and i selected following three issues out of which i wish to pick a one. But before jumping in, i need some guidance on which one to select. I thought it's best to ask from the list since i might not be aware of the severity of these issues. * XWIKI-2191 <http://jira.xwiki.org/jira/browse/XWIKI-2191> - (When user logout, his pages locks should be removed - Reported by Thomas Mortagne) * XWIKI-1538 <http://jira.xwiki.org/jira/browse/XWIKI-1538> - (Improve performance by efficiently using synchronized code - Reported by Sergiu Dumitriu) * XWIKI-671 <http://jira.xwiki.org/jira/browse/XWIKI-671> - (Refactor the code using deprecated API - Reported by Sergiu Dumitriu) Thank you very much for your time. - Asiri