[OPENENGSB-3822] Delete XLink UI to prepare for new one
[OPENENGSB-3822] Delete obsolete classes for XLink from API
[OPENENGSB-3786] Changed openXLinks to use an Array
[OPENENGSB-3786] Refactored XLink to use contextId, deprecated releative expiresIn option and implemented generateXLink
Merge pull request #914 from Mercynary/OPENENGSB-3786

[OPENENGSB-3786]