Make settings more explicit in tests
Initial grid card activation form code
Verify checksum
Require first code on grid card activation
Make grid card activation case-insensitive
Require long-enough keys for grid card activation
Remove some grid card associations from HOTP

- The admin behaves like with TOTP, google barcode works etc
Add a view for grid card generation
Update demo
Nag to the user in the demo if grid card is running out