adds extracols setting to admin config page
adds language strings for admin extracols settings
changes 'cols' to 'fields'
adds extrafields checkbox to lae graderreport user prefs
user pref respects admin default setting
display obeys admin and user settings
Merge pull request #4 from kwiliarty/wip-extracols-settings

A proposal for adding admin defaults and user preferences to hide or show extra user fields in the LAE Grader Report