Stitching is now done automatically in a sub process by the
server. This is much cleaner - and all we need to do is poll for
file updates.
I've also styled the log display slightly better.
checkExistingTasks was looking up the task's `self` link by
checking for `rel=self`, which failed. I have corrected this
to `rel="self"` - `self` would have evaluated to `undefined`.
The log viewer was scrolling to the bottom when new logs
appeared, but not when the status updated. This meant that the status update may have been invisible. I now scroll
when the status changes too, which should fix the problem.
I've tidied up the UI a bit here:
* The modal box stays open and must be explicitly closed.
Pretty much everywhere we want to use this, it would be nice
to see the final confirmation it's worked - so I have removed
the line that closes it after the task completes.
* The progress bar no longer animates after the task has
finished (logic previously didn't consider that state as the
bar wasn't visible except while it was running).
* A helpful message is printed when the task completes or is
cancelled.
Longer-running tasks would benefit hugely from showing the
operator a progress indicator. This branch will add a basic
log display allowing messages to be shown to the user.
This branch may also add an abort button to the above dialog.
