SQLite Database

+ added SQLNAME.java class of constants describing current Database
values.
+added DatabaseSqlite.java implementation of SQlite backend.

+ added default contor to MedicineAllergy
*changed Patient.setHumanGender(Gender) to
Patient.setPatientGender(Gender)

DatabaseList:
* SetLists() now marked as Override.
* delete doctor now deletes password as well
* delete password now private

*MINOR: changed some operand naming in Backend.java.