Tweaks regarding portal details

These are some tweaks to the portal details pane.

767275fdf5c364d20030ee6d9ba52e844f9acba4 shows the exact portal level in a tooltip, so you can easily see how much "resonator levels" are needed for a portal level upgrade.

a33bdcbf3843b49b1052c1a6dabbf1b8d50dfe62 calculates the link range even for portals that aren't fully deployed since the resonators might have decayed after links have been drawn. This way you can see which links are in danger of decaying. In this case, the link circle of the selected portal on the map is dashed. Also, details about the link range appear in a tooltip.

![preview](https://f.cloud.github.com/assets/2741656/1345673/86531634-3693-11e3-958a-6b06160e5e84.png)