### Please describe the problem.

Sometimes a consistency check is undesired, e.g. when one wants to unmount the external drive. Add a button (along Configure) to the bubble that says Consistency check in progress to the assistent.

### What steps will reproduce the problem?

Run an automatic conistency check.

### What version of git-annex are you using? On what operating system?

20141024

### Please provide any additional information below.

[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log


# End of transcript or log.
"""]]