added a function that checks for a valid email address

there are also some changes to the database due to accounts created
during testing
added a check for valid pin

changes to the database due to testing
added a comment and a space between functions
Saving As Backup

Put validation functions in the UI. doing a backup before moving them to
ATM
successfully moved input validation to ATM

moved IsEmailValid and IsPinValid to ATM from UI.
Everything seems to work as expected, hopefully this is the final
version
nothing, just respacing of some code in UI.cpp