Avoid authentication required after logging in

[wvengen]

When first going to Foodsoft, access is denied because there is no session.
The login screen redirects you to the members system, which does the login.
Then one is redirected back to Foodsoft, and logging in.

The previous alert authentication required is still in the flash, which is shown. This is confusion, avoid it.

[wvengen]

This can probably be avoided by clearing the flash before redirecting to the members system on login, or when the user has returned. Do make sure to test that other errors are not cleared (e.g. when the members system cannot be reached).
It needs to be changed in Foodsoft's vokomokum plugin.