Add buttons to show checkpoint id and execution time

[mhdirkse]

In the tree view we sometimes need the checkpoint uid or the execution time of the checkpoint. We should add two buttons above the tree so that the user can turn these on and off. The buttons should be small so we should use icons.

[mhdirkse]

We show the storage id at the root node and the checkpoint id with every checkpoint. Then the user needs to know that these should be combined with a # in between when a checkpoint is referenced from another report.