Update Bank.cpp

Fixes I/O for GAUL.
Update Bank.h

Fixes I/O for GAUL.
Update BankAccount.h

Fixes warning sign from GAUL.
Update BankClient.cpp

Fixes I/O for GAUL.
Update BankClient.h

Fixes I/O for GAUL.
Create BankCreditCard.cpp

Adds credit card class (if necessary?)
Create BankCreditCard.h
Update BankDatabase.txt
Update BankMaintainer.cpp
Update BankMaintainer.h
Update BankManager.cpp
Update BankManager.h
Update BankMember.h
Update BankMemberDatabase.cpp
Update BankMemberDatabase.h
Update IdManager.cpp
Update IdManager.h
Update BankProfile.h
Delete log.txt
Merge pull request #18 from bobAtk/patch-9

Update Bank.cpp - Fix file I/O for GAUL