Link to timesheet with relevant hours from unapproved listing

[copelco]

On the invoice summary, update the user links to point to the most recent timesheet with the violating entries.

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• Bitbucket: https://bitbucket.org/copelco/django-timepiece/issue/51
• Originally Reported By: Colin Copeland
• Originally Created At: 2011-08-15 14:59:07

[copelco]

• Changed status from new to duplicate.

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Original Comment By: Colin Copeland