Patient size import logs don't match URL - broken since d5dde08 July 2014?

[Ed McDonagh]

Export of import logs don't match any URL string, possibly since they were put into date folders in commit d5dde08 in July 2014, which seems a bit weird...

[Ed McDonagh]

Refs #344 by referring to task_id for log in link rather than the filename, and creating a new view to process the download based on the export download view. Needs testing.

→ <<cset 617323b15c3e>>

[Ed McDonagh]

Changed link URL and fixed error in view, now works, fixes #344

→ <<cset ed572d62cdff>>