Merge pull request #15 from l1ll1/onetab

extend load saved sessions to take the newer style json which includes a...
Merge pull request #16 from l1ll1/onetab

Onetab
Merge pull request #17 from l1ll1/onetab

Onetab
.json files shouldn't really be commit to git
Add the GPU flavour to CVL
Display an error dialog if we are unable to get a newsite list and the current sitelist is empty