First total initial data section is done

* Cancel redirects to Select Mailboxes
* Use redirect as it is safer than chain
Empty data table done!
Done URL
Added Number.prototype.toTimeDiffString in format.js
Progress totals are now updated
Mailbox progress data is working
Added action buttons

Redefined stopped action to copied
Discard mailbox action done

This has required a nice refactoring for progress bar
Activate mailbox action done
Show DONE button once all users has been migrated/cancelled
Added mailbox details during migration progress in a dialog

* Missing image
Minor doc annotations in core
Set progress to be run every 5s
Merge pull request #653 from Zentyal/ejhernandez/oc-migration-step3-ui

OpenChange upgrade step 3 UI