'Don't save' and 'Upload files' buttons

On the Job Edit screen a 'don't save' button will be handy if you want to just go back.

A button on the Job display screen a button to the upload files section will be handy.
only show button when job has an id.
Merge pull request #192 from nla/huw-new-buttons

'Don't save' and 'Upload files' buttons