Better nagivation between bridges

[arigo]

We need a better way to navigate between bridges: when we look at a list of operations, the guards with bridges attached should be marked (and stand out, with a direct link to the bridge); and when we go to a bridge we should know where it comes from, in the sense of which parent guard failed.

[arigo]

Related: the final "jump" instructions should have a clickable link to go to where they jump to. (Right now we can rebuild this info by looking at the address of the TargetDescr, but well.)

[planrich]

I have added this functionality and deployed it. jump an labels are not yet covered. working on that...