Added missing encounter complexity select box options for the situations where only one student is being evaluated on the patient encounter evaluation type.
Added "IN" method to Base model fetch methods

The "IN" comparison type used in sql queries was missing, so I've added it in now to be used by the fetchRow and fetchAll methods in the Base model. That means when a constraint with the "method" of "IN" is provided, an array of values is expected, and it will build the query with that comparison type against that array of values.
Merge branch 'develop' of https://github.com/EntradaProject/entrada-1x into develop