there is singleton study columns object created in db to reflect current state of the project (single study per smasch instance)

during save study is automatically injected into model

Test coverage unit tests

See merge request NCER-PD/scheduling-system!100

separate patient data from study data

Closes #181

See merge request NCER-PD/scheduling-system!99

address, city, country, data_born, default_written_communication_language, email, first_name, languages, last_name, phone_number, phone_number_2, phone_number_3, postal_code removed from study_subject (all this information is stored in subject)

the code is fixed so unit test passes