Added risk aversion, ultimatum, and trust treatment validation.
Added function phpdoc.
Moved common task entry functions and relationships to parent class TaskEntry.
Added functions getRandomTrustEntry() and getTrustEntries().
Moved common functions and relationship functions to the TaskEntry parent class.
moved common task entry functions and relationship methods to the TaskEntry class.
Added saveGroups, getProposerRoleId, and getReceiverRoleId functions, and removed private function matchPairMember.
Removed the subject(), setPayoff(), getPayoff(), and getSelectedForPayoff function as they are now inherited from TaskEntry.
Created the getNextUserId() and createUserAccount() functions.
Refactored the saving of treatments into their own respective functions.
Removed TODO.
Changed access of the proposer and receiver from the UltimatumRole to the UltimatumTreatment.
Added trust treatment data.
Added the trust treatment parameter data.
Refactor retrieval of the ultimatum role information from the UltimatumRole class to UltimatumGroup.
Add ultimatum fields to the add session form.
Added the trust treatment to subject experiment template.
Added old form data display to the registration template.
Created the TaskEntry class.
Created the TreatmentGroup class.