Configure UTF-8 input and output for TidyViewHelper

Change-Id: I926d523a84bd5ee8e1a954829e0b73bce8aed34a
Improve project listing in admin, add city/country/uid

Change-Id: Iaddee7200aa2bf22f3da5ca7d6cb183c55b05a34
Add submissionLastUpdated property to project, use it in reviewSubmission and XML export

Change-Id: I5caf60d174d753c5e02eebae65366cb2d03ded0c
Replace JavaScript Spider in reviewSubmission with pChart Spider image

Change-Id: Id6be34fb3f95ece63ad4b5889207e6f0cde9eb40
Set submissionLastUpdated on auto-saving Grading value

Change-Id: I3e9f8ba2253f0db07ce6e207530da551e7ae1a68
Don't allow exporting PDFs for projects with Grading errors

Change-Id: I5ad832e84e0ac2bf0f65a2b84287758cac336dae
Hide Export PDF button if Grading is empty

Change-Id: Ic31fbacb3e8eca59519180aa484dd084f3068873