Merge pull request #13 from l1ll1/CVLFAB-545-two-part-ui

Cvlfab 545 two part ui
Centre the passphrase dialog box.
use PBS on the cvllogin host to get a vncsession
Merge branch 'CVLFAB-545-two-part-ui' of git://github.com/CVL-dev/cvl-fabric-launcher into CVLFAB-545-two-part-ui