Progress indicator for import, export and fetch operations

I should mention a couple of points.

* Export progress starts out really slow because PrivacyManager.getRestrictions doesn't report on its progress. It will say "Export: Loading" during this phase.

* I also disabled the filters progressbar, maybe I shouldn't have done so. If not, it might be better to make it horizontal rather than round. On my phone it is gone so fast I never noticed its presence. Another option would be just to replace the text by "Calculating.."

![screenshot_2013-11-21-17-47-37](https://f.cloud.github.com/assets/3158606/1594478/72dd4110-52db-11e3-97fa-5ae928eef599.png)