More fixes to mount point handling.

1) Correctly sort >10 total partitions.

2) Don't allow user to specify duplicate mount points via
disklabel.

3) Fix mount point checking so that empty mount points
do not confuse logic.

4) Fix mount point checking so that duplicate mount points
from previous disk initialization are correctly detected.

5) Show configured partitions/mount points in partition order
(i.e. sorted by disk and then partition) rather than mount
point order. This seems easier to read to me and reflects the
order of user action. Sort the entries after user approval.

6) Clarify, clean up some verbiage and logic.

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