Bug 1781262

On anaconda's Installation Destination spoke, under the Storage Configuration heading, anaconda offers three options:

 * Automatic
 * Custom
 * Advanced Custom (Blivet-GUI)

Although only the blivet option is labeled as advanced, unfortunately even the normal custom partitioning is quite complex. Users who are unfamiliar with partitioning Linux systems who enter this mode are likely to become quite confused.

Worse, if you enter Custom partitioning to see how it works, it's very difficult to change your mind and select Automatic partitioning instead. There is no Back button. To get out, you have to press the Done button, notice the warning message at the bottom of the screen, read and understand the warning message (it's telling you to press Done a second time to continue), press the Done button a second time, press "Accept Changes" (which is scary because it looks like this might delete your data), then reenter the Installation Destination spoke. 

Although some design changes to make it easier to back out would be appropriate, I think we could simplify this for users by simply changing the strings we use for the options to make it less likely that inexperienced users would select them. Furthermore, using the name Blivet here doesn't make sense, because that is an internal codename that only Fedora developers could be expected to understand. So we could, for example, rename them to:

 * Automatic Partitioning
 * Expert Partitioning
 * Advanced Expert Partitioning

Of course users will still click them and wind up in the expert partitioning tools, but hopefully this will make them more likely to take the Automatic route.