Ensure that when a 'simple' calculation is used only one criteria is offered to grade against.

[Kevin Moore]

The existing code expects a one grade per peer per assessment. Adding more criteria break the calculations (since they are not expecting to loop over multiple criteria to collect grades).

Simplest solution would be to ensure that if the simple calculation is used then only one criteria is possible. This appears to give preserve the calculations.

[Kevin Moore]

The plugin is now working towards using the webPA algorithm only so this becomes defunct.

[Kevin Moore]

using webpa algorithm so the simple algorithm is superseded. The simple could still be used if the calculations accomodate the fact there are not multiple criteria.