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Reduce Shibboleth column length to 255 characters

This is required because MySQL doesn't support indexes on tables larger than 767 bytes.
(See http://dev.mysql.com/doc/refman/5.5/en/innodb-restrictions.html for documentation on that).

The current limit of 1024 was arbitrary anyways - according to http://www.switch.ch/aai/support/serviceproviders/persistentid.html , the real limit is 2036 characters.
This change fixes #390.
What we should really do - and this seems to be pondered by Shibboleth protocol designers anyways - is to hash the persistent ID, and to index over that.
If needed, we can still store the original long ID in the database.
Bumped font, changed text, fix for IE6
Merge pull request #389 from carschroeder/ie-message

Warning message if browser is IE7 or older
Simplify outdated message
Merge pull request #392 from phihag/fix-issue-390-shibboleth-id-length

Reduce Shibboleth column length to 255 characters