Deployed sheets are allowed to be named things that cause server errors when exporting gradebook

[Lyla Fujiwara]

Version: 1:2.1.0-0ubuntu1 (afraid of updating since the database is holding everyone's grades needed for reports in a few days)
Ubuntu 12.04

A worksheet was created and deployed to teachers to submit their grades. Upon trying to export their gradebooks, they now get the following message:

Exception
Exception: invalid worksheet name u'End of Term Marks for Term 1 2013'

When you change the name to End of Term Marks 1, it allows the worksheet to be exported.

[Gediminas Paulauskas (menesis)]

schooltool.gradebook 2.1.1 is a bugfix release that contains a fix for this bug, plus a few more, see http://book.schooltool.org/2.1-release-notes.html . You can get stable release updates from the SchoolTool PPA ppa:schooltool-owners/ppa