get rid of old authentication hacks
Postgres uses only an int4 for integer columns
integrate all login possibilities on one page

known: copy is bad
always redirect the user to his/her start page

I actually no idea why this was different before
provide access to is_superuser flag
adding auto-checking of admin bit when checking FSR bit
use variable to make the value more obvious
fix described issues and re-integrate trans tags
update test
applying the information from the form is now done in _post_clean and no longer in save

also fix order the order of the fields
Extend default login key validity and refresh key during import
clean form in form methods and not in view

now the error messages are in the right place
update/fix tests
removed lecturer flag
changed menu structure for lecturers
south migration (remove is_lecturer from db)
Switch columns of login page

some minor capitalization stuff and shortening texts
move the text into the error message
forgot a label
minor stuff