Validate '|' cannot be in a password

http://manage.dimagi.com/default.asp?60104

Monkey patches set_password. Displays "'|' is not allowed in a password" as the error in all three possible locations.
If you let it bleed through it will cause the upload to fail after the invalid row and throw a 500 error and doesn't tell the user what rows were incorrect and why.

If you look on lines 282 through 292, we do something very similar for usernames.