removed 30 characters limitation from username fields
removed 30 characters limitation from username fields

git-svn-id: fda6b4e7f465494e54a48e48229d49df8145d0fe@703 1bbb43ac-ffe0-11de-8c0c-f1c8ac664a8e

grischa/mytardis-mrtardis,grischa/mytardis-mrtardis