adapted C::Roles::PatientDemographics to work with RequestForm::Validate - moved some var constructions to wrapper methods overridden in RequestForm::Role::PDS; adapted trial_cases.pl script to generate one XL tab per trial - data includes patient so requires secure contact addresses
enclosed _check_demographic_details() pds vs patient comparisons within no uninitialized warnings block to prevent perl 5.14 complaining when lc method called
