UI: add support for deleting selected permanodes

Feature disabled for now, until the backend (corpus) part is ready.

Change-Id: Ib3527b8f3bfb6793bb60d5e91cd06bc8fab5a5c0
Merge "UI: add support for deleting selected permanodes"
Move ListMissingDestinationBlobs from pkg/client to blobserver

Change-Id: I7489531fe2a1a5127b2212d5a5f80d4c4c614353
Merge branch 'master' of https://camlistore.googlesource.com/camlistore